21.2 49,000 24.8 45,000 28.4 40,500 32 36,000 35.6 33,500 39.2 30,900 42.8 28,200 46.4 25,600 50 23,000 53.6 21,400 57.2 19,900 60.8 18,100 64.4 16,600 68 15,000 71.6 14,000 75.2 12,900 Temperature °F Value in resistance 78.8 11,900 82.4 10,850 86 9,800 89.6 9,100 68 15,000 71.6 14,000 75.2 12,900 78.8 11,900 82.4 10,850 86 9,800 89.6 9,100 93.2 8,500 96.8 7,900 100.4 7,200 104 6,500 113 5,600 122 4,600 131 4,000 140 3,400 158 2,300 176 1,700 194 1,300 (1 0f 2) E-18 error indicates that the T1 Supply Temperature sensor has read a value of more than 212°F. Verify the current supply temperature with a digital clamp-on thermometer connected to the supply pipe directly below the heat exchanger. Disconnect the Molex connector at the T1 supply sensor, this sensor reads 12K ohms at 77 °F. See resistance value chart next page for proper temperature and values at other temperatures. Using a digital multimeter, read the resistance value of your sensor and confirm your reading with the chart on page 2. If the resistance value is much higher or lower than the actual temperature per the resistance chart, replace the sensor. Reconnect the Molex connector to the sensor if resistance value is correct. Ensure that there is no air present in the heat exchanger or heating loops. Check the air vent on the boiler heat exchanger for any signs of corrosion, replace if defective. Purge/bleed any heating loops in the system.
32 36,000 35.6 33,500 39.2 30,900 42.8 28,200 46.4 25,600 50 23,000 53.6 21,400 57.2 19,900 60.8 18,100 64.4 16,600 68 15,000 71.6 14,000 75.2 12,900 Temperature °F Value in resistance 78.8 11,900 82.4 10,850 86 9,800 89.6 9,100 68 15,000 71.6 14,000 75.2 12,900 78.8 11,900 82.4 10,850 86 9,800 89.6 9,100 93.2 8,500 96.8 7,900 100.4 7,200 104 6,500 113 5,600 122 4,600 131 4,000 140 3,400 158 2,300 176 1,700 194 1,300 (1 0f 3) E-19 error is referring to the T2 return sensor reading a value of more than 212°F. Verify the current supply temperature with a digital clamp-on thermometer connected to the return pipe directly below the heat exchanger: Disconnect the Molex connector from the T2 return sensor. This sensor reads 12K at 77 °F, see resistance chart on page 3 for additional temperatures and resistance values. Using a digital multimeter, read the resistance value of your sensor and confirm your reading with the chart on page 3. -If the resistance value is much higher or lower than the actual temperature per the resistance chart, replace the sensor. Check for any external heating sources, such as a wood boiler piped into the existing boiler loop. If this boiler is running in conjunction with the Rinnai boiler it could be overheating the system’s water. Disconnect or isolate other external sources. Inspect connector at both the T2 sensor and MCBA for loose, damaged or broken fittings or connections. Replace any defective components or wiring harnesses found. Inspect all T2 sensor connectors, wiring harnesses and pins for any signs of moisture or corrosion. Replace all fittings or harnesses found to have corrosion on them. Locate and correct the source of the moisture. Possible causes, cross contamination from the venting,
(1 0f 2) E-19 NTC Values listed below are for the following sensors—T1 Supply Sensor, T2 Return Sensor, T3 DHW Sensor, T4 Outside Sensor and T5 Flue Gas Sensor Temperature °F Value in resistance resistance -4 99,000 -0.4 90,000 3.2 82,000 6.8 74,00 10.4 66,000 14 58,000 17.6 53,500 21.2 49,000 24.8 45,000 28.4 40,500 32 36,000 35.6 33,500 39.2 30,900 42.8 28,200 46.4 25,600 50 23,000 53.6 21,400 57.2 19,900 60.8 18,100 64.4 16,600 68 15,000 71.6 14,000 75.2 12,900 Temperature °F Value in resistance 78.8 11,900 82.4 10,850 86 9,800 89.6 9,100 68 15,000 71.6 14,000 75.2 12,900 78.8 11,900 82.4 10,850 86 9,800 89.6 9,100 93.2 8,500 96.8 7,900 100.4 7,200 104 6,500 113 5,600 122 4,600 131 4,000 140 3,400 158 2,300 176 1,700 194 1,300 (1 0f 2) Error code is given when the T2 return water sensor temperature value is more than 50°F above the T1 supply sensor for a fixed time.
64.4 16,600 68 15,000 71.6 14,000 75.2 12,900 Temperature °F Value in resistance 78.8 11,900 82.4 10,850 86 9,800 89.6 9,100 68 15,000 71.6 14,000 75.2 12,900 78.8 11,900 82.4 10,850 86 9,800 89.6 9,100 93.2 8,500 96.8 7,900 100.4 7,200 104 6,500 113 5,600 122 4,600 131 4,000 140 3,400 158 2,300 176 1,700 194 1,300 (1 0f 1) E-32 refers to a short at the T2 return sensor: Inspect connector at both the T2 sensor and MCBA for loose, damaged or broken fittings or connections. If damage is found replace any damaged wiring, harness or component found to be defective. Inspect all T2 sensor connectors, wiring harnesses and pins for any signs of moisture or corrosion. Replace all fittings or harnesses found to have corrosion on them. Locate and correct the source of the moisture. Possible causes, cross contamination from the venting, condensate trap, condensate collector, etc…. If no corrosion or moisture is found on the connector or T2 sensor, disconnect the Molex connector from the sensor. Using a digital multimeter set it to read Ohms. Check the resistance value from the sensor. Match the value to the chart found on the next page based on the temperature the sensor is reading. If the meter reading shows “OL” or “Open” replace the T2 sensor. If the resistance value is much higher or lower than the value listed, replace the T2 sensor. Check the source of the end switch connected to terminals 22 and 23, this should be a “dry contact” with no voltage from the end switch present. Disconnect the wires from terminals 22 and 23, check for any voltage on the wires that were removed. If voltage is found on these wires, repair the issue by reconfiguring the wiring or adding a
If after replacing the display controller and ribbon cable you still get an E69 code, replace the MCBA. After replacing the conversion kit or both the conversion kit and the MCBA you may see either or “A—d” on the display screen of the boiler. If that occurs, press and hold the STORE button until COPY is displayed on the screen. You may only see the word COPY appear for a brief second. Once you see COPY on the screen, the boiler should reset and start to transfer the stored information between the conversion kit and the MCBA. After replacing the conversion kit or the conversion kit and the MCBA, you may also see an E04 on the screen. Keep pressing the RESET button for no more than one second until you see “d—A”, then follow the instructions in step 3 listed above.