Rinnai Error Code 43: Water Level Circuit Error
Warning: Your Rinnai water heater has detected a water level issue. It's safe to use other appliances, but call a professional for repair.
How to Fix Rinnai Code 43
- Check the water supply to ensure it's turned on and there are no kinks in the hose
- Listen for any unusual noises coming from the water heater, which could indicate a leak
- If you suspect a leak, turn off the water supply and call a professional immediately
How to Reset Rinnai Code 43
- 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 43 mean?
Error code 43 on your Rinnai water heater indicates a problem with the water level circuit. This circuit ensures your water heater has enough water to operate safely and efficiently. The most common causes for this error are a faulty water level switch or a low water level in the tank.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Water Level Switch | RIN-1120000000 | — |
| Temperature and Pressure Relief Valve (T&P Valve) | RIN-1120000001 | — |
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 |