Rinnai Corporation
February 28, 2018

Request Concerning Use of Bathroom Heater/Dryers
and Notice of Inspections and Parts Replacement

With respect to certain models of bathroom heater/dryers manufactured by Rinnai
Corporation between June 2001 and January 2009, it has been discovered that, on rareoccasions, it is possible that the equipment could experience burnout. For this reason,
Rinnai has decided to carry out inspections and parts replacement free of charge.
Rinnai takes this situation very seriously and sincerely apologizes for any
inconvenience. We will also work hard to ensure that similar events do not recur inthe future.
Due to inadequate consideration of the equipment’s design, the fan motor (hereinafter“circulating fan motor”), which circulates hot air and the like in the bathroom, waspositioned inside the ventilation passage. As a result, water can intrude inside thecirculating fan motor, which could cause a short circuit in the motor’s internal control
board. It has been discovered that, on rare occasions, this may cause the circuit board
to ignite, resulting in equipment burnout.
There have been three accidents that appear to be caused by this problem (Shizuoka
Prefecture in January 2014, Aichi Prefecture in June 2016, and Tokyo in August2017), which resulted in burnout of the equipment and contamination of surroundings.
None of the accidents caused injuries to humans.
To ensure that the aforementioned equipment is used safely, Rinnai issued a press
release today (February 28, 2018). On the following day (March 1), we will placeadvertisements in major newspapers, set up a toll-free phone number, and post asection on our website to make contact with customers. For customers in specifiedlocations, we will make contact via direct mail or posting, and we will perform
inspections and replace parts with those that do not allow water intrusion.
Until such parts are replaced, please refrain from using the equipment models listed
below. We sincerely apologize for inconvenience caused the inspections and parts
replacements, and thank customers for their understanding and cooperation.

Request to customers using the equipment concerned
We ask that you refrain from using the equipment’s drying, cool air, and heating
functions until inspections are completed. The following functions can be used.
- Ventilation function and constant ventilation function (Rinnai brand, Toho Gasbrand)- Ventilation function (Tokyo Gas brand)11. Applicable models, manufacturing period, number of units
The following models manufactured by Rinnai apply in this case.
- Period of manufacture: June 2001 to January 2009
- Number of units: 33,147

External view of equipment concerned
Applicable models, remote control units, manufacturing period, number of units
RemoteBrand
Model namecontrol
Manufacturing period
namenumber
HBD-3301ACSK-J2
RBH-C331K2SN
HBD-3301ACSK-J2(B)RBH-C331K2SN(A)
BHY-04E
HBD-3301ACSK-J3
August 2001 to
RBH-C331K3SN
March 2005
HBD-3301ACSK-J3(B)RBH-C331K3SN(A)
HBD-3301ACS
BHY-04A
RBH-C331SN
HBD-3301ACSK-J2
HBD-3301ACSK-J2(B)BHY-04F
HBD-3301ACSK-J3
HBD-3301ACSK-J3(B)August 2001 to
HBD-3301ACS
January 2005
HBD-3302ACSK-2
BHY-04C
HBD-3302ACSK-2(B)
HBD-3302ACSK-3(B)June 2001 to
IBD-3301ACS―
January 20092

Numberof units

17,977

14,510660

2. Inquiries from customers
We will set up a dedicated toll-free number to receive inquiries about all of theproducts concerned (Rinnai Corporation brand, Toho Gas Co., Ltd. brand, and Tokyo
Gas Co., Ltd. brand).
(1) Toll-free number: 0120-113531 (Bathroom Heater/Dryer Inspection Reception
Center)(2) Reception start: February 28, 2018 (Wednesday)(3) Reception hours: 9:00–19:00 (including Saturdays/Sundays) until March 11, 2018(Sunday); 9:00–17:00 (excluding Saturdays/Sundays and public holidays) fromMarch 12, 2018 (Monday).
3. How to identify equipment concerned
Because it is difficult to confirm the model number of the main unit installed in theceiling, please confirm the “Brand Mark” displayed on the remote control unit, andconfirm the “Remote Control Number” of the remote control unit in case Rinnai
brand and Toho Gas brand.
Brand nameRemotecontrol
numberModel name
HBD-3301ACSK-J2

Remote control displays（Example: BHY-04E）

RBH-C331K2SN
HBD-3301ACSK-J2(B)RBH-C331K2SN(A)

BHY-04E

HBD-3301ACSK-J3
RBH-C331K3SN
HBD-3301ACSK-J3(B)RBH-C331K3SN(A)
HBD-3301ACS

BHY-04A*

RBH-C331SN

Brand markRemote control
number

HBD-3301ACSK-J2（Example:BHY-04F）

HBD-3301ACSK-J2(B)BHY-04F

HBD-3301ACSK-J3
HBD-3301ACSK-J3(B)
HBD-3301ACS
HBD-3302ACSK-2

BHY-04C*

HBD-3302ACSK-2(B)Brand mark

HBD-3302ACSK-3(B)Remote control
number* The Rinnai brand remote control (BHY–04A) and Toho Gas brand remote control(BHY–04C) may be used for other equipment (not subject to inspections) as well.

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The Tokyo Gas brand remote control displays the model name (IBD –3301ACS)
under the brand mark, so please confirm the “Model Name.”RemoteModel namecontrol
Remote control displays
Brand namenumberIBD-3301ACS―

Brand mark, model name

4. Details of inspection and parts replacement work
Because the circulating fan motor is positioned in the ventilation passage, water andthe like may intrude into the equipment’s interior, which may cause burnout on
extremely rare occasions. Therefore, in addition to checking the equipment’soperation, we will replace the parts with those that do not allow water intrusion, as apreventive measure. We estimate that the work will take around 3 hours.

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