Ultra-Low Temperature Freezers 

RevcoTM RDE Series, FormaTM FDE 

Series, HERAfreezeTM HDE Series and 

Thermo ScientificTM TDE Series

Installation and Operation

329712H01 • Revision A • March 2019
IMPORTANT Read this instruction manual. Failure to follow the instructions in this manual can result in 

damage to the unit, injury to operating personnel, and poor equipment performance.

CAUTION All internal adjustments and maintenance must be performed by qualified service personnel.

Material in this manual is for informational purposes only. The contents and the product it describes are 

subject to change without notice. Thermo Fisher Scientific makes no representations or warranties with 

respect to this manual. In no event shall Thermo be held liable for any damages, direct or incidental, arising 

from or related to the use of this manual.

© 2019 Thermo Fisher Scientific Inc. All rights reserved.
Contents

Models......................................................................... 1

Safety Considerations .................................................. 2

Unpacking ................................................................... 3

Packing List ............................................................. 3

General Recommendations.......................................... 4

Temperature Monitoring ........................................... 4

General Usage ......................................................... 4

Initial Loading ........................................................... 4

Battery Door Opening / Closing................................ 4

Operating Standards.................................................... 5

Electrical Specifications............................................ 5

Installation.................................................................... 6

Location................................................................... 6

Leveling.................................................................... 6

Backup System (Optional) ........................................ 6

Super Insulated Cabinet Construction ...................... 6

Door Operation ........................................................ 6

Pressure Equalization Port........................................ 7

Installing the Remote Alarm Connector..................... 7

Intended Use............................................................ 7

Operation..................................................................... 8

Initial Start Up........................................................... 8

Operation Overview.................................................. 8

Display ..................................................................... 8

Settings.................................................................... 9
Power Down ............................................................ 10

Backup System (Optional)............................................ 11

CO2 and LN2 Precautions ....................................... 11

Installation................................................................ 11

Start Up ................................................................... 12

Operation................................................................. 12

Chart Recorders (Optional)........................................... 13

Set Up and Operation .............................................. 13

Changing Chart Paper.............................................. 13

Calibration Adjustment ............................................. 13

Maintenance ................................................................ 14

Cleaning the Condenser........................................... 14

Cleaning the Condenser Filter................................... 14

Gasket Maintenance ................................................ 14

Defrosting the Freezer .............................................. 14

Battery Maintenance ................................................ 14

Maintenance Schedule............................................. 15

Troubleshooting Guide................................................. 16

Error Codes ................................................................. 19

Warranty...................................................................... 20

Warranty (International) ................................................ 21

Appendix A: Alarm Summary ....................................... 22

Contact Information .................................................... 25
Thermo Fisher Scientific ULT Freezers Models | 1

Models

Table 1. Applicable Models

Brand - Model Size (xxx) Voltage (*)

Forma - FDExxx86F* 300 / 400 / 500 / 600 A / D / V 

Thermo Scientific –TDExxx86F* 300 / 400 / 500 / 600 A / D / V 

HERAfreeze – HDExxx86F* 300 / 400 / 500 / 600 A / D / V 

Revco - RDExxx86F* 300 / 400 / 500 / 600 A / D / V 
2 | Safety Considerations Thermo Fisher Scientific ULT Freezers

Safety Considerations

In this manual, the following symbols and conventions are 

used:

Below are important safety precautions that apply to this 

product:

This symbol used alone indicates important 

operating instructions which reduce the risk of 

injury or poor performance of the unit.

CAUTION: This symbol, in the context of a 

CAUTION, indicates a potentially hazardous 

situation which if not avoided could result in 

minor to moderate injury or damage to the 

equipment.

WARNING: This symbol indicates potentially 

hazardous situations which, if not avoided, could 

result in serious injury or death.

WARNING: This symbol indicates situations 

where dangerous voltages exist and potential for 

electrical shock is present.

The snowflake symbol indicates extreme low 

temperatures and high risk of frostbite. Do not 

touch bare metal or samples with unprotected 

body parts.

This symbol indicates a need to use gloves during 

the indicated procedures. If performing 

decontamination procedures, use chemically 

resistant gloves. Use insulated gloves for handling 

samples and when using liquid nitrogen.

Before installing, using or maintaining this 

product, please be sure to read this manual and 

product warning labels carefully. Failure to follow 

these instructions may cause this product to 

malfunction, which could result in injury or 

damage.

Use this product only in the way described in the 

product literature and in this manual. Before using 

it, verify that this product is suitable for its 

intended use. If this equipment is used in a 

manner not specified by the manufacturer, the 

protection provided by the equipment may be 

impaired.

Do not modify system components, especially 

the controller. Use OEM exact replacement 

equipment or parts. Before use, confirm that the 

product has not been altered in any way.

WARNING: Your unit must be properly grounded 

in conformity with national and local electrical 

codes. Never connect the unit to overloaded 

power sources.

WARNING: Disconnect the unit from all power 

sources before cleaning, troubleshooting, or 

performing other maintenance on the product or 

its controls.

WARNING: “Caution, risk of fire”. This unit is 

charged with hydrocarbon refrigerants.
Thermo Fisher Scientific ULT Freezers Unpacking | 3

Unpacking

At delivery, examine the exterior for physical damage while 

the carrier’s representative is present. If exterior damage is 

present, carefully unpack and inspect the unit and all 

accessories for damage.

If there is no exterior damage, unpack and inspect the 

equipment within five days of delivery. If you find any damage, 

keep the packing materials and immediately report the 

damage to the carrier. Do not return goods to the 

manufacturer without written authorization. When submitting 

a claim for shipping damage, request that the carrier inspect 

the shipping container and equipment.

The packaging can be stored and re-used.

Packing List

Inside the freezer cabinet is a bag containing:

• A handle lock key

• A USB drive with user manual, including translated 

versions

• Certificates of conformance and calibration

• A remote alarm contact connector

• Posts for rear spacing

If you have ordered a chart recorder, the bag will also contain:

• Recorder installation instructions

• Extra paper

If you have ordered a backup system, the cabinet will also 

contain:

• A hose assembly

• English and metric connectors

If specified on the order, the bag may also include:

• A QC temperature graph and test log

• Calibration information
4 | General Recommendations Thermo Fisher Scientific ULT Freezers

General Recommendations

Temperature Monitoring

General Usage

This refrigeration system is designed to maintain ultra-low 

temperatures with safety in an ambient environment within 

15°C to 32°C (59°F to 90°F), only when the freezer is used for 

storage.

Avoid opening the door for extended time periods since 

chamber temperature air will escape rapidly. Also, keep the 

inner doors closed as much as possible. When room air, 

which is higher in humidity, replaces chamber air, frost may 

develop in the chamber more rapidly.

Initial Loading

Allow the freezer to operate at the desired temperature 

for a minimum of 12 hours before loading.

Load the freezer one shelf at a time, beginning with the top 

shelf. After loading each shelf, allow the freezer to recover to 

the desired set point before loading the next shelf. Repeat this 

process until the freezer is fully loaded.

Battery Door Opening / 

Closing

To open the grille door, pull the door from the top right corner 

as shown in the figure below.

To close the grille door, push the door against frame to hold 

latch in position.

Figure 1. Door Opening 

IMPORTANT NOTE: Thermo Fisher Scientific 

recommends the use of a redundant and 

independent temperature monitoring system so 

that the freezer can be monitored continuously 

for performance commensurate with the value of 

product stored.

WARNING: This unit is not a “rapid-freeze” 

device. Freezing large quantities of liquid, or highwater content items, will temporarily increase the 

chamber temperature and will cause the 

compressors to operate for a prolonged time 

period.

CAUTION: Failure to follow these procedures or 

overloading the unit may cause undue stress on 

the compressors or jeopardize user product 

safety.
Thermo Fisher Scientific ULT Freezers Operating Standards | 5

Operating Standards

The freezers described in this manual are classified for use as 

stationary equipment in a Pollution Degree 2 and Over voltage 

Category II environment.

These units are designed to operate under the following 

environmental conditions:

• Indoor use

• Altitude up to 2000 m

• Maximum relative humidity 60% for temperatures within 

15°C to 32°C (59°F to 90°F)

• Main supply voltage fluctuations not to exceed ±10% of 

the nominal voltage.

Electrical Specifications

The last character in the model number listed on the dataplate identifies the electrical specifications for your unit. 

Specific unit current rating is listed on the data-plate.

The voltage types are A, D and V as specified in the following 

table:

Table 2. Electrical Specifications by Size and 

Voltage

Size/

Voltage Voltage Frequency Current

300A 115 V 60 Hz 12.6 A

300D 208-230 V 60 Hz 5.6 A

300V 230 V 50 Hz 5.9 A

400A 115 V 60 Hz 13.0 A

400D 208-230 V 60 Hz 5.9 A

400V 230 V 50 Hz 5.3 A

500A 115 V 60 Hz 12.5 A

500D 208-230 V 60 Hz 5.0 A

500V 230 V 50 Hz 5.9 A

600A 115 V 60 Hz 12.7 A

600D 208-230 V 60 Hz 6.2 A

600V 230 V 50 Hz 6.1 A
6 | Installation Thermo Fisher Scientific ULT Freezers

Installation

Location

Install the unit in a level area free from vibration with a 

minimum of 8" (20 cm) of space on the top and sides, 6" (15 

cm) in back. Refer to Leveling for further instructions on 

leveling cabinets. Allow enough clearance so that door can 

swing open at least 85°.

The rear spacing posts provided with the freezer can be used 

to ensure proper clearance. To install the spacing posts, 

screw them into the back side of the unit, in the rear deck 

area.

Do not position the equipment in direct sunlight or near 

heating diffusers, radiators, or other sources of heat. The 

ambient temperature range at the location must be 15°C to 

32°C (59°F to 90°F).

Wiring

Leveling

Make sure that the floor is level. The unit must be level both 

front to back and side to side.

The 300 and 400 box capacity models are equipped with one 

or two leveling legs on the right hand side. Leveling legs on 

300 size must be used as a safety precaution.

Ensure to lock the brakes for units equipped with casters.

Backup System (Optional)

If you are using a CO2 or LN2 backup system, refer to 

Backup System (Optional) for installation and operation 

instructions.

Super Insulated Cabinet 

Construction

In all models, the cabinet walls have a vacuum insulation core 

encapsulated by a sealed film laminate.

Door Operation

Upright freezer models are equipped with an advanced 

assembly specifically designed for ultra-low temperature 

freezers.

Features include:

• One-hand operation

• A front-accessible lock

• Hasps for a standard padlock to provide additional 

security. Length of the shackle must be between 3/4" 

(1.9 cm) and 1 1/2" (3.8 cm)

• Durable construction for reliable operation and safe 

product storage

WARNING: Do not exceed the electrical rating 

printed on the data plate located on the lower 

left side of the unit.

CAUTION: Connect the equipment to the 

correct power source. Incorrect voltage can 

result in severe damage to the equipment.

CAUTION: For personal safety and trouble-free 

operation, this unit must be properly grounded 

before it is used. Failure to ground the equipment 

may cause personal injury or damage to the 

equipment. Always conform to the National 

Electrical Code and local codes. Do not connect 

the unit to overloaded power lines.

CAUTION: Do not position the unit in a way that 

impedes access to the disconnecting device or 

circuit breaker in the back of the unit.

CAUTION: Always connect the freezer to a 

dedicated (separate) circuit. Each freezer is 

equipped with a service cord and plug designed 

to connect it to a power outlet which delivers the 

correct voltage. Supply voltage must be within 

±10% of the freezer rated voltage.

CAUTION: Never remove or disable the 

grounding prong from the service cord plug. If the 

prong is removed, the warranty is invalidated.

CAUTION: Never drill holes in or near the cabinet 

walls. Drilling could damage the insulation and 

make the unit inoperable.
Thermo Fisher Scientific ULT Freezers Installation | 7

• Door ramp alignment feature

Opening the Door

1. Remove the padlock if installed.

2. Grasp the latch handle and pull it toward yourself until the 

latch disengages.

3. Keep pulling by the latch handle to open the main door.

Closing the Door

Note: The latch does not self-engage automatically when you 

close the door. You must rotate the latch into the open 

position first.

1. Grasp the latch handle and pull it toward yourself, 

rotating the latch into the open position.

2. Move the freezer door into the closed position and gently 

push the handle away from you, making sure that the 

latch engages fully with the cabinet strike.

3. Keep applying gentle pressure to the latch handle until 

the latch is securely in closed position.

4. Insert the key and rotate counterclockwise to lock.

5. Replace the padlock as required.

Pressure Equalization Port

When an upright ultra-low temperature freezer door is 

opened, room temperature air rushes into the storage 

compartment. When the door is closed, the fixed volume of 

air is cooled rapidly. Pressure drops below atmospheric 

pressure, resulting in a substantial vacuum. Re-entry into the 

cabinet is impossible until internal pressures are returned to 

atmospheric pressure. Without a pressure equalization 

mechanism, it can take, in extreme cases, several hours 

before the door can easily be reopened.

All upright models feature a port that provides vacuum relief 

after door openings. The pressure equalization port is located 

in the door behind the eye-level panel on the front of the 

freezer. Although the port is heated and designed to selfdefrost, excessive frost accumulation on the inner door could 

eventually restrict air flow. Therefore, you should periodically 

inspect the inner door and brush away any loose frost using a 

stiff nylon brush.

Installing the Remote 

Alarm Connector

The remote alarm contacts are located on the back of the 

freezer above and to the left of the power switch. After 

installing the wiring from the remote alarm to the connector, 

install the connector to the freezer micro-board.

The pin configuration is shown in Figure 2 below.

Figure 2. Remote Alarm Pin Configuration

For systems that alarm in closed state, connect to pins 5 & 6.

For systems that alarm in open state, connect to pins 6 & 7.

The contacts will trip in the event of a power outage, high 

temperature alarm, low temperature alarm or door ajar alarm.

Intended Use

The –86°C freezer (refer to Models for the specific model 

series) described in this manual are high performance units for 

professional use. These products are intended for use as cold 

storage in research use and as a general purpose laboratory 

freezer, storing samples or inventory at operating 

temperatures between –50°C and –80°C.

It is not considered a medical device and has therefore not 

been registered with a medical device regulatory body (e.g., 

FDA): that is, it has not been evaluated for the storage of 

samples for diagnostic use or for samples to be re-introduced 

to the body.

This unit is not intended for use in classified hazardous 

locations, nor to be used for the storage of flammable 

inventory.

CAUTION: When moving the freezer, always 

grasp cabinet surfaces; never pull the freezer by 

the latch handle.
8 | Operation Thermo Fisher Scientific ULT Freezers

Operation

Initial Start Up

To start the freezer, complete the following steps:

1. Plug the freezer into the power outlet.

2. Turn the power switch ON. You can find the switch in 

back of the freezer, on the bottom right.

3. Once the freezer is turned ON, the user interface will 

begin a start up procedure. Once ready for operation, the 

temperature is displayed on the screen.

Operation Overview

Once you have successfully completed the initial start up 

procedures, the freezer starts operating normally and the only 

actions required are:

• Setting the operating and alarm set points.

• Activating the CO2 or LN2 backup system if installed. For 

instructions on backup settings and activating the 

system, refer to Backup System (Optional).

Display

The display screen below is the default screen.

Figure 3. Display

The control panel consists of the 5 touch-point buttons 

located on the right side of the display.

• Warm Alarm value - The range of the warm alarm 

temperature is –40°C to within 5°C of setpoint. 

Note : The warm alarm will be disabled for 12 hours 

from a warm start condition.

• Cold Alarm value - The range is –99°C to within 5°C 

of setpoint.

Note : A setpoint change may automatically change 

the warm/cold alarm setpoints as well to maintain a 

minimum 5°C separation from the control setpoint.

• Offset value - This is used for calibration. Range is 

–10°C to +10°C. Default is 0. 

Entering a positive offset value will yield a colder 

cabinet temperature. 

Entering a negative offset value will yield a warmer 

cabinet temperature.

• Setpoint security code – This code is a 3-digit 

numeric code. Refer to Setpoint Security.

• Backup system type (if backup system is installed) 

– Set the type to either LN2 or CO2 corresponding to 

the backup system that is installed.

• Backup system setpoint (if backup system is 

installed) - This setpoint indicates the temperature at 

which the backup system will begin cooling the cabinet. It is recommended to set the backup system 

setpoint at a minimum of 10°C warmer than the con1. Alarm Bell – This icon indicates visual and 

audible alarm that accompanies various alarm 

states. Pressing the alarm bell while in an alarm 

state will snooze the audible alarm for 10 

minutes.

2. Plus – Increases the value of the selected setting.

3. Check Mark – Saves a change to the selected 

value.

4. Minus – Decreases the value of the selected 

setting.

5. Settings – The settings icon represents the 

various settings including:
Thermo Fisher Scientific ULT Freezers Operation | 9

trol setpoint. For more information, refer to Backup 

System (Optional).

The message panel on the top indicates freezer health status 

and the various alarm or warning states.

Settings

If setpoint security is enabled, you must first enter the security 

code to make any setpoint changes. Refer to Setpoint 

Security to adjust setpoint security.

Control Setpoint

To modify the control temperature setpoint:

• Press the plus or minus button while displaying unit 

temperature (“Actual” is illuminated). The control setpoint 

is displayed

• Adjust setpoint to desired temperature

• Select the checkmark button to save the new control 

setpoint. 

Other Setpoints and Settings 

• Press the settings button to enter Settings menu

• Continue pressing the settings button until the desired 

setting is illuminated on lower horizontal panel. (If backup 

system is installed, CO2 or LN2 is displayed after pressing 

the settings button 5 times.)

• Adjust the setting to desired temperature or value using 

the plus or minus buttons

• Press the checkmark button to save the new 

temperature or value

• After the value is saved, display will show the next option 

in the settings menu.

To return to the unit temperature display:

• Press the settings button until unit temperature is 

displayed (“Actual” is illuminated)

• If there is no activity after 5 minutes, the unit will 

automatically return to the temperature display.

Warm Alarm Test

Press the plus and checkmark buttons at the same time to 

initiate the warm alarm test. During the warm alarm test, the 

actual cabinet temperature will not be displayed. The display 

temperature will increase. Once the display temperature 

reaches the warm alarm setpoint, the alarm is activated. After 

5 seconds, the test will automatically end and the display will 

return to the actual cabinet temperature.

Setpoint Security

• To adjust setpoint security in the settings menu, press the 

settings button 4 times

• The setpoint security code consists of 3 digits, each of 

which must be set in sequence from left to right

• Use the plus or minus button to adjust each value, and 

the checkmark button to save each value of the 3-digit 

security code

• If you forget the setpoint security code, contact customer 

support.

1. Wrench – This is a generic service warning which 

corresponds to an intermittent flashing error code 

displayed on the screen. Refer to Error Codes

for a list of error codes.

2. Door – This icon will illuminate when the door is 

open. A door open for more than 3 minutes will 

result in an audible alarm.

3. Heart – The heart is the health status for the 

freezer. A green heart indicates normal freezer 

operation. In an alarm state, this icon is not 

illuminated.

4. Thermometer – This indicates when the cabinet 

temperature exceeds either warm alarm or cold 

alarm setpoints and the audible alarm will occur.

5. Snooze Bell – This is only illuminated during an 

active alarm that has been silenced by the user.
10 | Operation Thermo Fisher Scientific ULT Freezers

Power Down

To power down the ULT, first turn the breaker switch, located 

at the rear of the freezer, to the off position. Once the switch 

is in the off position, the display will show "OFF" followed by 

"YES" and then "NO" in 2 second intervals. The checkmark 

will also be illuminated while "YES" and "NO" are showing. 

Press the checkmark while "YES" is showing. With a flashing 

"YES", you are required to confirm by pressing the checkmark 

button a second time. Power down will then be complete.

If the checkmark button is pressed while "NO" is illuminated 

or if no action is taken for 5 minutes, this is interpreted as a 

power failure. In this case, the user interface will stay on (using 

battery power only) and an audible alarm will sound to 

indicate power failure. If installed, the backup system will 

remain active and inject per the backup system settings.
Thermo Fisher Scientific ULT Freezers Backup System (Optional) | 11

Backup System (Optional)

For all ultra-low temperature cold storage products, we 

recommend the use of a backup system (BUS) for the 

security of your samples.

When you purchase a built-in CO2 or LN2 optional backup 

system for the freezer, backup control is integrated into the 

main user interface.

Note: For stand-alone backup systems, refer to installation 

instructions provided with the backup system kit.

CO2 and LN2 Precautions

The following are precautions for using liquid CO2 and LN2

backup systems.

Installation

Field installed systems are supplied with complete installation 

and operating instructions. If your system is factory installed, 

the freezer is shipped with a coiled length of hose to connect 

the freezer to the bottles:

• 1/4” Flexible Hose with fittings for connection to the CO2

supply.

• 1/2” Flexible Hose with fittings for connection to the LN2

supply.

To install,

1. Straighten the coiled hose.

2. Connect one end to the labeled connection on the 

freezer.

• Tighten the nut two flats past finger tight, approximately 

120 degrees.

Note: For CO2, remove the threaded fitting from the nut on 

the end of the copper tubing to access nut for connection to 

the freezer. Discard the threaded fitting.

3. Attach the other end to the supply bottle or building 

supply fitting.

• For CO2:

• Remove Nipple from adapter (NPT Connection). 

Remove cable tie to release alternative nut and 

washer. Ensure the correct nut fitting is supplied over 

the nipple (US or European).

Note: Always purchase the cylinders which are 

equipped with siphon tubes for withdrawing liquid 

from the bottom of the cylinder. CO2 cylinders 

must be kept at room temperature to function 

properly. LN2 bottles are functional at any 

reasonable temperature.

WARNING: If a CO2 or LN2 cylinder falls and a 

valve is knocked off, the cylinder becomes a 

deadly and completely unguided missile. 

Transport the cylinders in a hand-truck or cart 

with secure chain ties for the cylinder. After 

cylinders are connected to the equipment, 

securely attach them with chains to a solid 

stationary object such as a building column.

WARNING: CO2 and LN2 liquids are nonpoisonous but are very cold and will burn 

unprotected skin. Always wear protective eye 

wear and clothing when changing cylinders or 

working on the piping systems attached to an 

active source of liquid refrigerant.

WARNING: The gases produced by evaporation 

of CO2 or LN2 are non-poisonous but displace 

the oxygen in a confined space and can cause 

asphyxiation. Do not store the cylinders in 

subsurface or enclosed areas.

CAUTION: When closing the cylinder valve, 

make sure that the injection solenoid is energized 

to allow all the liquid to bleed off instead of being 

trapped in the supply hose. Failure to do this 

results in activation of the pressure relief device, 

which could damage the freezer and requires 

replacing if it is activated.

CAUTION: For models ordered with factory 

installed built-in backup systems, the flow of 

liquid CO2 or LN2 will be discontinued if the door 

is opened during operation of the backup 

system. For units operated with free-standing, 

field installed type backup system, the flow of 

liquid CO2 or LN2 will be discontinued upon door 

opening only if the switch provided with the freestanding package is installed on the freezer.
12 | Backup System (Optional) Thermo Fisher Scientific ULT Freezers

• Add 2 wraps of Teflon tape clockwise to the 1/4” 

NPT fitting (on the nipple) when viewed from the 

threads. Tighten the NPT fittings approximately 2 

turns from finger tight (approximately 720°). 

Note : The top of the nipple has a hex configuration, 

allowing for use of a wrench when the nut is pulled 

down.

• Add washer to nipple inside of nut (unless CO2

supply has a built in washer).

Note : Small raised area of washer fits into groove of 

nipple. The washer will feel snug when trying to shift 

side-to-side on nipple. The washers are designed for 

a limited number of attachments/disconnections 

from the supply and may wear over time. If washer 

appears worn and causes CO2 leakage, replace 

washer (Part Number 45705H03).

• Wrench tighten the supply nut to the supply.

• For LN2:

• Attach the fitting to the supply and wrench tighten.

Note: Do not twist, torque, or subject the flexible hose to 

sharp bends. Doing so may shorten the life of the hose.

Start Up

When the unit is started, it will recognize if a backup system is 

installed.

1. Follow the instructions in Backup System (Optional) to 

set the backup system type and setpoint.

2. It is recommended to test backup system operation prior 

to sample storage.

Test BUS Operation

After the freezer has stabilized and both batteries are fully 

charged, the BUS can be tested to verify proper operation.

1. Disconnect the AC power to the freezer by turning the 

power switch off.

2. As the freezer warms up, verify the BUS injects at the 

desired temperature. Displayed temperature may vary by 

a few degrees from injection temperature due to the 

differences in probe locations.

Note: On a monthly basis, it is recommended to test your 

backup system, check the supply tank system levels, and 

check the backup battery voltage. 

Operation

The backup system can run for a minimum of 24 hours on 

battery power.

On average, a backup system in operation uses 8 to 10 lbs. 

per hour of CO2 (3.6 to 4.5 L/hr) or LN2 (4.5 to 5.6 L/hr) at an 

ambient temperature of 25°C. 

This rate will vary depending on set point, load, ambient 

temperature and freezer size.
Thermo Fisher Scientific ULT Freezers Chart Recorders (Optional) | 13

Chart Recorders (Optional)

Panel-mounted six-inch seven-day recorders are available as 

options for all freezer models except for the smaller (300 and 

400 box capacity) models.

Set Up and Operation

To prepare the recorder to function properly, complete the 

following steps:

1. Open the grille door to access the recorder.

2. Install clean chart paper (refer to Changing Chart 

Paper).

3. Remove the plastic cap from the pen stylus or ink pen 

and close the recorder door.

Recorder operation begins when the system is powered on. 

The recorder may not respond until the system reaches 

temperatures within the recorder’s range.

Figure 4. Chart Recorder

Figure 5. Chart Buttons

Changing Chart Paper

To change the chart paper, complete the following steps:

1. Locate the pressure sensitive buttons at the front, upper 

left of the recorder panel.

2. Press and hold the Change Chart button (#3) for one 

second. The pen will move off the scale.

3. Unscrew the center nut, remove the old chart paper, and 

install new chart paper. Carefully align the day and time 

with the reference mark (a small groove on the left side of 

the recorder panel).

4. Replace the center nut and hand tighten. Press the 

Change Chart button again to resume temperature 

recording.

Calibration Adjustment

This recorder has been accurately calibrated at the factory 

and retains calibration even during power interruptions. If 

required, however, adjustments can be made as follows:

1. Run the unit continuously at the control set point 

temperature. Continue steady operation for at least two 

hours to provide adequate time for recorder response. 

2. Measure cabinet center temperature with a calibrated 

temperature monitor.

3. Compare the recorder temperature to the measured 

cabinet temperature. If necessary, adjust recorder by 

pressing the left (#1) and right (#2) chart buttons.

Note: The stylus does not begin to move until the top center 

button (#3) is held for five seconds.

CAUTION: Do not use sharp or pointed objects 

to depress the chart buttons. This may cause 

permanent damage to the recorder.
14 | Maintenance Thermo Fisher Scientific ULT Freezers

Maintenance

Cleaning the Condenser

Clean the condenser at least every six months; more often if 

the laboratory area is dusty.

To clean the condenser, complete the following steps:

1. Pull the grille door open.

2. Vacuum the condenser.

3. Inspect the filter cleanliness and clean as required.

4. Close the grille door. 

Cleaning the Condenser 

Filter

Clean the condenser filters every two or three months.

1. Pull the grille door open.

2. Remove the filter.

3. Shake the filter to remove loose dust, rinse the filters in 

clean water, shake the excess water from the filter, and 

replace the filter.

4. Close the grille door.

Gasket Maintenance

Periodically check the gaskets around the door for punctures 

or tears. Leaks are indicated by a streak of frost which forms 

at the point of gasket failure. Make sure that the cabinet is 

level (refer Leveling for leveling information).

Keep the door gaskets clean and frost free by wiping gently 

with a soft cloth.

Defrosting the Freezer

Defrost the freezer once per year or whenever the ice buildup 

exceeds 3/8”. To defrost, complete the following steps:

1. Remove all products and place in another ULT freezer.

2. Turn off the freezer.

3. Open the outer door and all inner doors.

4. Let the freezer stand with doors open for at least 24 

hours. This allows both the interior and foamed 

refrigeration system to warm to room temperature.

5. Dispose of the ice and wipe out any water standing in the 

bottom of the cabinet.

6. If there is freezer odor, wash the interior with a solution of 

baking soda and warm water. 

7. Clean the exterior with any common household cleaner. 

8. Close the doors, restart the freezer and reload. Refer 

Initial Loading to follow the instructions.

Battery Maintenance

The freezer monitors the voltage status of the battery daily 

and indicates the battery’s voltage via visual and auditory 

alarm. Replace the battery as indicated by system alarms or 

as necessary per individual status evaluation. Check the 

battery connections regularly. Although not required, annual 

battery replacement is recommended to ensure proper 

battery status in the event of power failure. 

For safety, it is recommended to power off the unit and 

disconnect it from the power source before replacing the 

battery. Battery terminals are color coded in red and black. 

Ensure the corresponding colored wires are connected to the 

matching color terminals on the battery. The battery is 

installed with terminals oriented toward the condenser 

compartment or hinge side of the freezer’s outer door (refer 

Battery Specification). With proper installation, the red wire 

should be connected to the rear battery (positive) terminal and 

the black wire to the front (common) terminal. 

Failure to properly connect the battery can damage electrical 

components and potentially hinder normal operation of the 

freezer. Consult a certified service technician if there are any 

questions or concerns about battery maintenance.

WARNING: Unauthorized repair of your freezer 

will invalidate your warranty. Contact Technical 

Service. See Contact Information for phone 

numbers. 

CAUTION: Maintenance should only be 

performed by trained personnel.
Thermo Fisher Scientific ULT Freezers Maintenance | 15

Battery Specification: 

Rechargeable sealed lead-acid battery, 12 V, 7.0 Amp Hr. 

Replacement batteries can be purchased directly from 

Thermo Fisher Scientific.

Figure 6. Battery Specification

Maintenance Schedule

Regular maintenance is important to keep the unit working 

properly. Inspect/clean as directed in the manual.

Item Interval

Ice/Frost 

build up

To maintain proper closure of inner 

doors, remove any ice or frost build up 

around the gasket, inner doors, and 

breakers as necessary.

Gasket

Periodically check the gaskets around 

the door for punctures or tears. 

Periodically clean the ice-build up 

around the gasket.

Filter Clean the condenser filter(s) every two to 

three months.

Condenser Clean every six months, more often if the 

laboratory area is dusty.

Battery

Replace the battery as indicated by 

system alarms or as necessary per 

individual status evaluation. Check the 

battery connections regularly. Although 

not required, annual battery replacement 

is recommended to ensure proper 

battery status in the event of power 

failure.

Defrost Defrost the freezer once a year or when 

the ice build exceeds 3/8” (0.95 cm)
16 | Troubleshooting Guide Thermo Fisher Scientific ULT Freezers

Troubleshooting Guide

This section is a guide to troubleshoot general operational problems.

Problem Cause Solution

Unit warming.

Unit set to –80°C but can’t 

make temperature (Not 

reaching set point).

Unit recovers slowly to set 

point.

Warm load / Over load.

Allow ample time to recover from loading warm product. 

Do not overload cabinet. Refer Initial Loading in user 

manual for loading procedures.

Hot environment. Check, if the location meets ambient requirements (within 

15°C to 32°C or 59°F to 90°F) and away from hot objects.

Dirty condenser and 

condenser filter.

Clean condenser and filter. Refer Cleaning the 

Condenser and Cleaning the Condenser Filter in user 

manual.

Not enough space for air 

circulation.

Install the unit in a level area free from vibration with a 

minimum of 8" (20 cm) of space on the top and sides, 6" 

(15 cm) in back.

Icing/Frost due to high 

relative humidity.

Check if the location meets requirements. Maximum 

relative humidity 60% for temperatures within 15°C to 

32°C (59°F to 90°F).

Excess frost build-up in 

chamber.

Defrost the unit. Refer Defrosting the Freezer in user 

manual.

Frost build-up on outer 

door gasket.

Occasionally scrape the ice on the gasket. Do not use a 

sharp tool. Be careful not to puncture the rubber gasket.

Gasket damage. Check for punctures or tears on gasket. Replace if 

necessary. Refer Gasket Maintenance in user manual.

Prolonged door openings. Avoid opening of door for a prolonged time. Allow ample 

time for recovery after door opening.

Inadequate power supply. Check for proper voltage to the unit.

Either of the compressors 

are not working. Call service.

User interface (Display) 

failure. Breaker switch off. Check circuit breaker and reset to on position. Always use a dedicated, properly grounded circuit.

Power failure to the unit. Power supply stopped /

Breaker switch off.

Confirm that the cord is securely plugged in.

Plug another appliance into the outlet to see if power is 

present.

Always use a dedicated, properly grounded circuit.
Thermo Fisher Scientific ULT Freezers Troubleshooting Guide | 17

Unit tripping the circuit 

breaker.

Shared power source. Never connect unit to overloaded power source. Always 

use a dedicated (separate) circuit.

Unit plugged into wrong 

power outlet.

Plug the unit into proper power source to deliver correct 

voltage. 

Unit not grounded.

Your unit must be properly grounded in conformity with 

national and local electrical codes. Troubleshooting 

procedures involving live voltage is dangerous and if 

done improperly can result in injury and/or death. This 

troubleshooting should be performed by trained 

personnel only.

Use of extended cords. Do not use an extension cord. Make sure the unit 

supplied power cord is plugged directly into power outlet.

Excessive frost build-up 

around perimeter of door.

Icing/Frost due to high 

relative humidity.

Check if the location meets requirements. Maximum 

relative humidity 60% for temperatures within 15°C to 

32°C (59°F to 90°F).

Occasionally scrape the ice on the outer door.

Be careful not to puncture the rubber gasket.

Excessive and prolonged 

door openings. Avoid opening door for a prolonged time.

Gasket damage.

Check for punctures or tears on gasket. If replacement is 

necessary, call service. Refer Gasket Maintenance in 

user manual.

Unit is over cooling.

Set points may have 

changed.

Adjust the setpoint to run at desired setpoint under 

settings. 

Temperature offset may 

have changed.

Try adjusting the offset. Temperature offset can be set by 

accessing the settings menu via the settings button.

Unknown. Try re-starting the unit. If this doesn’t help call service.

Unit compressors run 

continuously.

Freezer set point is low. Check whether the setpoint is in operating range. Change 

the setpoint if necessary.

Frost build up. Defrost the unit. Refer Defrosting the Freezer in user 

manual.

Dirty condenser. Clean the condenser and condenser filter.

Gasket damage.

Check for punctures or tears on gasket. If replacement is 

necessary, call service. Refer Gasket Maintenance in 

user manual.

Cabinet temperature reached 

an alarm condition, but 

suitable alarm is not 

activated.

Alarm setpoints may be 

changed.

Check the present setpoints for temperature alarm 

conditions. Change the setpoints if required.

Problem Cause Solution
18 | Troubleshooting Guide Thermo Fisher Scientific ULT Freezers

Problem with temperature 

validation/calibration.

Cabinet temperature 

displayed doesn’t match 

with actual temperature.

Customers performing on-site temperature calibration 

may observe as much as a 2°C variation when an external 

probe is placed next to the freezer control probe. This 

variation is normal due to optimisation of the control 

system to ensure temperature uniformity throughout the 

cabinet.

Unit is constantly alarming.

Exterior door is closed but 

not sealed completely.

Clean any ice build-up on gasket and/or cabinet surface. 

Check for punctures or tears on gasket. 

Door open alarm, exterior 

door not closing 

completely.

Open door completely and immediately close and latch it.

Door open alarm, exterior 

door is closed but not 

sealed completely.

Defrost exterior door gasket and make sure the door is 

completely sealed.

Alarm set points may have 

changed. Change the set points as required.

Unit cycle on-percentage is 

increasing (Compressors are 

running more often than 

before).

Ambient conditions. Unit performance is directly impacted by these causes 

mentioned. Try maintaining ambient conditions, reducing 

load, reducing door openings.

Once temperature is stable, cycle dynamics should return 

to normal range. If not call service.

Warm load (or) over load.

Frequent and prolonged 

door openings.

Difficult to close / open the 

outer door.

Outer door alignment issues.

Unit is not level.

Make sure the unit is level.

Refer Leveling in the user manual for levelling procedure.

Frost accumulated on 

outer door gasket.

Scrape the ice occasionally on outer gasket.

Do not puncture gasket.

Door latch problem. Ensure door latch is securing. If issue persists, call 

service.

Difficult to close / open the 

inner door.

Frost accumulated around 

inner door. Remove frost or ice build-up from inner door assembly.

Inner door latches 

damaged. Call service.

Vibration noise.

Rattling noise/ Loud noise.

Unit is not level. Check if the unit is installed in a level area free from 

vibration. (Refer Leveling in user manual)

Loose side panels. Check side panel screws, tighten them if necessary.

Rubber tubing separators 

and/or compressor 

dampeners may have 

loosened.

Call service.

Problem Cause Solution
Thermo Fisher Scientific ULT Freezers Error Codes | 19

Error Codes

Error Code Description

E00 Undefined model

E01 Firmware Build Incompatible

E02 Control Probe Failure

E03 Heat Exchanger Probe Failure

E04 Power Failure

E05 Failure to Reach Setpoint

E06 BUS Battery Failure

E07 System Battery Failure

E08 Lost Communication Failure (Main to UI)

E09 Lost Communication Failure (BUS)

E10 Stuck Button

E11 Ambient Probe Failure
20 | Warranty Thermo Fisher Scientific ULT Freezers

Warranty

Be sure to register your warranty online:

www.thermofisher.com/labwarranty

THERMO FISHER SCIENTIFIC USA FREEZER WARRANTY 

FOR Revco RDE series, Forma FDE series, HERAfreeze HDE 

series and Thermo Scientific TDE series

The Warranty Period starts two weeks from the date your 

equipment is shipped from our facility. This allows for shipping 

time so the warranty will go into effect at approximately the 

same time your equipment is delivered. The warranty 

protection extends to any subsequent owner during the 

warranty period.

Component parts proven to be non-conforming in materials 

or workmanship will be repaired or replaced at Thermo Fisher 

Scientific's expense, labor included, for a period of five years. 

Installation and calibration is not covered by this warranty 

agreement. The Technical Services Department must be 

contacted for warranty determination and direction prior to 

any work being performed. Expendable items, i.e., glass, 

filters, pilot lights, light bulbs and door gaskets are excluded 

from this warranty.

Replacement or repair of component parts or equipment 

under this warranty shall not extend the warranty to either the 

equipment or to the component part beyond the original five 

year warranty period. The Technical Services Department 

must give prior approval for the return of any components or 

equipment.

THIS WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL 

OTHER WARRANTIES, WHETHER WRITTEN, ORAL, OR 

IMPLIED. NO WARRANTIES OF MERCHANTABILITY OR 

FITNESS FOR A PARTICULAR PURPOSE SHALL APPLY. 

Thermo shall not be liable for any indirect or consequential 

damages including, without limitation, damages relating to 

lost profits or loss of products.

Your local Thermo Fisher Scientific Sales Office is ready to 

help with comprehensive site preparation information before 

your equipment arrives. Printed instruction manuals carefully 

detail equipment installation, operation, and preventive 

maintenance.

If equipment service is required, please call your Technical 

Services Department at 1-866-984-3766 (USA and Canada). 

We're ready to answer your questions on equipment 

warranty, operation, maintenance, service, and special 

applications. Outside the USA, contact your local Thermo 

Fisher Scientific office or distributor for warranty information.
Thermo Fisher Scientific ULT Freezers Warranty (International) | 21

Warranty (International)

THERMO FISHER SCIENTIFIC FREEZER INTERNATIONAL 

WARRANTY FOR Revco RDE series, Forma FDE series, 

HERAfreeze HDE series and Thermo Scientific TDE series 

The Warranty Period starts two months from the date your 

equipment is shipped from our facility. This allows for shipping 

time so the warranty will go into effect at approximately the 

same time your equipment is delivered. The warranty 

protection extends to any subsequent owner during the 

warranty period. Dealers who stock our equipment are 

allowed an additional four months for delivery and installation, 

providing the warranty card is completed and returned to the 

Technical Services Department.

Component parts proven to be non-conforming in materials 

or workmanship will be repaired or replaced at Thermo Fisher 

Scientific's expense, labor excluded, for a period of five years. 

Installation and calibration is not covered by this warranty 

agreement. The Technical Services Department must be 

contacted for warranty determination and direction prior to 

any work being performed. Expendable items, i.e., glass, 

filters, pilot lights, light bulbs and door gaskets are excluded 

from this warranty.

Replacement or repair of component parts or equipment 

under this warranty shall not extend the warranty to either the 

equipment or to the component part beyond the original five 

year warranty period. The Technical Services Department 

must give prior approval for the return of any components or 

equipment.

THIS WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL 

OTHER WARRANTIES, WHETHER WRITTEN, ORAL, OR 

IMPLIED. NO WARRANTIES OF MERCHANTABILITY OR 

FITNESS FOR A PARTICULAR PURPOSE SHALL APPLY. 

Thermo shall not be liable for any indirect or consequential 

damages including, without limitation, damages relating to 

lost profits or loss of products.

Your local Thermo Fisher Scientific Sales Office is ready to 

help with comprehensive site preparation information before 

your equipment arrives. Printed instruction manuals carefully 

detail equipment installation, operation, and preventive 

maintenance.

If equipment service is required, please contact your local 

Thermo Fisher Scientific office or local distributor.

We're ready to answer your questions on equipment 

warranty, operation, maintenance, service, and special 

applications. Outside the USA, contact your local Thermo 

Fisher Scientific office or distributor for warranty information.
22 | Appendix A: Alarm Summary Thermo Fisher Scientific ULT Freezers

Appendix A: Alarm Summary

Alarm Summary

Alarm Message Warning 

Icon

Remote 

Alarm Event Description

Warm Alarm Thermometer Yes

The freezer temperature has exceeded the warm alarm set 

point. 

Prolonged door openings and warm product loading may 

cause warm alarms. 

Cold Alarm Thermometer Yes The freezer temperature has exceeded the cold alarm set 

point.

Door Open Ajar Door Yes Door open for greater than 3 minutes will cause door open 

alarm. 

Control Probe 

Failure Wrench Yes

Cannot display cabinet temperature. The freezer will 

continue to operate in full run mode. Contact customer 

service.

Display will intermittently show "E02".

Heat Exchange 

Probe Failure Wrench Yes

The freezer will continue to operate with current freezer 

setpoints, but cabinet temperature variation will increase. 

Contact customer service.

Display will intermittently show "E03".

Ambient Probe 

Failure Wrench Yes

Ambient Probe TC has malfunctioned. This doesn't affect 

the performance of the unit. Contact service for further 

assistance. 

Display will intermittently show "E11".

Main to UI Lost 

Communication Wrench Yes

A communication error has occurred within the system. 

Contact customer service.

Display will intermittently show "E08".

BUS Lost 

Communication Wrench Yes

A communication error has occurred within the backup 

system. Contact customer service.

Display will intermittently show "E09".

Failure to Reach 

Set point Wrench Yes

Door openings or product loading may cause this 

notification. Allow unit to stabilize. If condition persists, 

contact customer service.

Display will intermittently show "E05".

Power Failure Alarm Wrench Yes

Unit in power failure mode. 

Display operating on battery power. Check unit plug, unit 

circuit breaker in the ON position, and supply voltage.

Display will intermittently show "E04".
Thermo Fisher Scientific ULT Freezers Appendix A: Alarm Summary | 23

Wrong Model Alarm Wrench Yes

Invalid Control Model Alarm. Contact service to ensure the 

correct model is selected for the system to avoid cargo 

loss.

Display will intermittently show "E00".

Firmware Build 

Incompatible Wrench Yes

Firmware build indicates incompatibility that can result in 

modules to be non-coherent.

Display will intermittently show "E01".

System Battery 

Failure Alarm Wrench Yes System Battery Disconnected or Failed. 

Display will intermittently show "E07".

Bus Battery 

Failure Alarm Wrench Yes BUS Battery Disconnected or Failed

Display will intermittently show "E06".

Stuck Button Alarm Wrench Yes A button has been pressed for more than 5 minutes.

Display will intermittently show "E10".

Alarm Summary

Alarm Message Warning 

Icon

Remote 

Alarm Event Description
WEEE Compliance

WEEE Compliance. This product is required to comply with the European Union’s Waste

Electrical & Electronic Equipment (WEEE) Directive 2012/19/EU. It is marked with the

following symbol. Thermo Fisher Scientific has contracted with one or more

recycling/disposal companies in each EU Member State, and this product should be

disposed of or recycled through them. Further information on our compliance with these

Directives, the recyclers in your country, and information on Thermo Scientific products

which may assist the detection of substances subject to the RoHS Directive are available at

www.thermofisher.com/WEEERoHS.

WEEE Konformittät. Dieses Produkt muss die EU Waste Electrical & Electronic

Equipment (WEEE) Richtlinie 2012/19/EU erfüllen. Das Produkt ist durch folgendes

Symbol gekennzeichnet. Thermo Fisher Scientific hat Vereinbarungen getroffen mit

Verwertungs-/Entsorgungsanlagen in allen EU-Mitgliederstaaten und dieses Produkt muss

durch diese Firmen widerverwetet oder entsorgt werden. Mehr Informationen über die

Einhaltung dieser Anweisungen durch Thermo Scientific, dieVerwerter und Hinweise die

Ihnen nützlich sein können, die Thermo Fisher Scientific Produkte zu identizfizieren, die

unter diese RoHS. Anweisungfallen, finden Sie unter www.thermofisher.com/WEEERoHS.

Conformità WEEE. Questo prodotto deve rispondere alla direttiva dell’ Unione Europea

2012/19/EU in merito ai Rifiuti degli Apparecchi Elettrici ed Elettronici (WEEE). 

È marcato col seguente simbolo.Thermo Fischer Scientific ha stipulato contratti con una o

diverse società di riciclaggio/smaltimento in ognuno degli Stati Membri Europei. Questo

prodotto verrà smaltito o riciclato tramite queste medesime. Ulteriori informazioni sulla

conformità di Thermo Fisher Scientific con queste Direttive, l’elenco delle ditte di

riciclaggio nel Vostro paese e informazioni sui prodotti Thermo Scientific che possono

essere utili alla rilevazione di sostanze soggette alla Direttiva RoHS sono disponibili sul sito

www.thermofisher.com/WEEERoHS.

Conformité WEEE. Ce produit doit être conforme à la directive euro-péenne

(2012/19/EU) des Déchets d’Equipements Electriques et Electroniques (DEEE). Il est

marqué par le symbole suivant. Thermo Fisher Scientific s’est associé avec une ou plusieurs

compagnies de recyclage dans chaque état membre de l’union européenne et ce produit

devraitêtre collecté ou recyclé par celles-ci. Davantage d’informations sur laconformité de

Thermo Fisher Scientific à ces directives, les recycleurs dans votre pays et les informations

sur les produits Thermo Fisher Scientific qui peuvent aider le détection des substances

sujettes à la directive RoHS sont disponibles sur www.thermofisher.com/WEEERoHS.

Great Britain

Deutschland

Italia

France
Contact Information

Thermo Fisher Scientific products are backed by a global technical support team ready to support your applications. We offer 

cold storage accessories, including remote alarms, temperature recorders, and validation services. 

Visit www.thermofisher.com/cold or call:

For countries not listed here, visit www.thermofisher.com and go to the Contact Us page under the Services menu to locate the 

contact information for your area.

Thermo Fisher Scientific Inc.

275 Aiken Road 

Asheville, NC 28804

United States

Countries Sales 

North America +1 866 984 3766

India toll free 1800 22 8374

India +91 22 6716 2200 

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UK/Ireland +44 870 609 9203

Find out more at thermofisher.com/cold

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