Rinnai Water Heater Error Codes
Complete list of Rinnai water heater error codes with causes and how to fix them.
02
🔴
Rinnai Water Heater error code 02: Cold water — no gas or ignition issue.
Technician Required
03
🟢
Rinnai Water Heater error code 03: Bath fill problem.
✓ DIY Possible
05
🔴
Rinnai Water Heater error code 05: Abnormal combustion.
Technician Required
07
🟢
Rinnai Water Heater error code 07: Water temperature abnormally high.
Technician Required
10
🔴
Rinnai Water Heater error code 10: Abnormal combustion — CO risk.
Technician Required
11
🔴
Rinnai Water Heater error code 11: No ignition.
Technician Required
12
🔴
Rinnai Water Heater error code 12: Flame failure — burner goes out.
Technician Required
13
🟢
Rinnai Water Heater error code 13: Thermistor short circuit.
Technician Required
14
🟢
Rinnai Water Heater error code 14: Thermal fuse blown — overheating protection.
Technician Required
16
🟢
Rinnai Water Heater error code 16: Hot water over 203°F / 95°C.
Technician Required
25
🟢
Rinnai Water Heater error code 25: Neutralizer full (condensing units).
Technician Required
31
🟢
Rinnai Water Heater error code 31: Thermistor open circuit.
Technician Required
32
🟢
Rinnai Water Heater error code 32: Thermistor short circuit.
Technician Required
33
🔴
Rinnai Water Heater error code 33: Exhaust/flue thermistor fault.
Technician Required
34
🟢
Rinnai Water Heater error code 34: Combust air/exhaust thermistor fault.
Technician Required
35
🟢
Rinnai Water Heater error code 35: Heat exchanger thermistor failure.
Technician Required
41
🟢
Rinnai Water Heater error code 41: Fan operation failure.
Technician Required
51
🔴
Rinnai Water Heater error code 51: Gas valve solenoid malfunction.
Technician Required
52
🔴
Rinnai Water Heater error code 52: Gas modulation valve failure.
Technician Required
55
🔴
Rinnai Water Heater error code 55: Gas valve fault.
Technician Required
56
🔴
Rinnai Water Heater error code 56: Combustion air fan fault.
Technician Required
57
🟡
Rinnai Water Heater error code 57: System controller communication error.
Technician Required
58
🟢
Rinnai Water Heater error code 58: Abnormal sensor reading.
Technician Required
61
🔴
Rinnai Water Heater error code 61: Combustion fan failure.
Technician Required
65
🟢
Rinnai Water Heater error code 65: Water flow control valve failure.
Technician Required
71
🟢
Rinnai Water Heater error code 71: Solenoid valve failure.
Technician Required
72
🔴
Rinnai Water Heater error code 72: Flame rod failure.
Technician Required
73
🔴
Rinnai Water Heater error code 73: Burner sensor abnormal.
Technician Required
79
🟢
Rinnai Water Heater error code 79: Water temperature sensor failure (bath fill).
✓ DIY Possible