Rinnai Error Code 57: Bypass Servo Valve Error
Warning: Your Rinnai water heater is experiencing a bypass servo valve error, which has caused it to shut down. This is not an immediate safety risk, but it does require professional repair.
How to Fix Rinnai Code 57
- Check if the water heater is receiving power
- Try resetting the unit by turning off the power at the circuit breaker for 30 seconds and then turning it back on
- If the unit doesn't reset, call a professional HVAC technician
How to Reset Rinnai Code 57
- 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.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Rinnai Error Code 57 Mean?
The Rinnai 57 error code indicates that there's an issue with the bypass servo valve in your water heater. This valve is responsible for directing water flow between the tank and the heat exchanger. When it malfunctions, it can cause the unit to shut down to prevent overheating or other damage. This error is typically caused by a faulty valve, but it could also be due to a problem with the valve's wiring or control board.
Common Causes
- Faulty bypass servo valve
- Wiring issue related to the servo valve
- Control board malfunction
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Water heater is not producing hot water | Check if the unit is displaying the 57 error code | Yes, the code should be displayed |
| The error code is displayed | Inspect the bypass servo valve for any visible damage or signs of wear | No visible damage or wear |
Applicable Rinnai Models
- CU(gas)
- HE(dual_fuel)
- HE++ Series(gas)
- I-SERIES(gas)
- NCB(gas)
- NPE(gas)
- RE(gas)
- REP(gas)
- RL(gas)
- RU(gas)
- RUCS(gas)
- RX(gas)
- RXP(gas)
- Rinnai NCB Series(gas)
- Rinnai NPE Series(gas)
- Rinnai R Series(gas)
- Rinnai RL Series(natural_gas)
- Rinnai RU Series(natural_gas)
- Rinnai RUR Series(gas)
- Rinnai VSP(gas)
- V(gas)
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Bypass Servo Valve | RIN-10192000 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Rinnai model families as 57.
| 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 |