Rinnai Error Code 73: Circuit Board Setting Error
Warning: Your Rinnai water heater has detected a circuit board setting error, which may affect its functionality. It's safe to operate, but a professional should address it.
How to Fix Rinnai Code 73
- Check if any recent power fluctuations or user interventions might have caused the issue.
- If you've recently changed any settings, try resetting them to default using the control panel.
- If the issue persists, contact a professional Rinnai technician for further diagnosis and repair.
How to Reset Rinnai Code 73
- Turn off the unit using the power button on the front panel.
- Turn off the gas supply valve.
- Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
- Restore power at the breaker, then open the gas valve.
- Turn the unit back on. If the error returns, the underlying issue needs repair.
What does 73 mean?
Rinnai's error code 73 indicates a circuit board setting issue in your water heater. This could be due to a software glitch, a faulty board, or incorrect settings. The system might not function optimally, but it's safe to use until a professional resolves the issue.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Circuit Board | RIN-123456 | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| 02 | Stagnant Water Detection | Warning |
| 10 | Air Supply/Exhaust Blockage | Warning |
| 11 | No Ignition | Warning |
| 12 | Flame Failure | Warning |
| 14 | Thermal Fuse | Warning |
| 16 | Over-Temperature | Warning |
| 19 | Electrical Grounding | Warning |
| 25 | Condensate Overflow | Warning |
| 29 | Condensate Neutralizer | Warning |
| 31 | Inlet Thermistor Failure | Warning |