Rinnai Error Code 99: PCB Replace Required
Warning: Your Rinnai water heater is displaying a 'PCB Replace Required' error. This indicates a problem with the control board, which is not an immediate safety risk but requires professional attention.
How to Fix Rinnai Code 99
- Step 1: Turn off the power to your water heater at the circuit breaker.
- Step 2: Contact a licensed HVAC technician for repair. Do not attempt to open the water heater or replace the PCB yourself.
- Step 3: If you notice any unusual noises, smells, or water leaks, shut off the water heater immediately and contact a professional.
How to Reset Rinnai Code 99
- 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 99 mean?
The 'PCB Replace Required' error on your Rinnai water heater means that the main control board (PCB) has detected an issue and needs to be replaced. This could be due to a fault in the board itself or a problem with one of the components it controls. The error is displayed on the digital display, typically as '99'.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| PCB (Main Control Board) | RIN-0012000000 | — |
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 |