All Error Codes
High Medium Low
| Code | Description | Severity | Quick Action |
|---|---|---|---|
| 55 | Rinnai Code 55 - False Fire Detection | High | Shut down & call tech |
| 02 | Stagnant Water Detection | Medium | Call tech support |
| 10 | Air Supply/Exhaust Blockage | Medium | Check venting |
| 11 | No Ignition | Medium | Call tech support |
| 12 | Flame Failure | Medium | Check gas & reset |
| 14 | Thermal Fuse | Medium | Call tech support |
| 15 | Rinnai Code 15 - Hot Water Temperature Too High | Medium | Call tech support |
| 16 | Over-Temperature | Medium | Call tech support |
| 17 | Rinnai Code 17 - Exhaust or Intake Blockage | Medium | Check venting |
| 18 | Rinnai Code 18 - Exhaust Thermistor Fault | Medium | Check venting |
| 19 | Electrical Grounding | Medium | Call tech support |
| 25 | Condensate Overflow | Medium | Call tech support |
| 29 | Condensate Neutralizer | Medium | Call tech support |
| 31 | Inlet Thermistor Failure | Medium | Call tech support |
| 32 | Outlet Thermistor Failure | Medium | Call tech support |
| 33 | Heat Exchanger Thermistor | Medium | Call tech support |
| 34 | Combustion Air Thermistor | Medium | Call tech support |
| 41 | Exhaust Temperature High | Medium | Check venting |
| 43 | Water Level Circuit Error | Medium | Call tech support |
| 52 | Solenoid Valve Failure | Medium | Call tech support |
| 57 | Bypass Servo Valve Error | Medium | Call tech support |
| 61 | Fan Motor Failure | Medium | Clean air filter |
| 63 | Rinnai Code 63 - Excessive Temperature Rise | Medium | Call tech support |
| 65 | Water Flow Control Valve | Medium | Call tech support |
| 70 | PCB Failure | Medium | Call tech support |
| 71 | Gas Valve Circuit Error | Medium | Call tech support |
| 72 | Flame Rod Detection | Medium | Check gas & reset |
| 73 | Circuit Board Setting Error | Medium | Call tech support |
| 79 | Fan Current Detection | Medium | Clean air filter |
| 99 | PCB Replace Required | Medium | Call tech support |