Rinnai Error Code 32: Outlet Thermistor Failure
Warning: Your Rinnai water heater is displaying a 32 error code, indicating an outlet thermistor failure. This issue requires professional repair to prevent potential water damage.
How to Fix Rinnai Code 32
- Check if the water heater is set to the correct temperature (around 120°F or 49°C) and that the thermostat is functioning properly.
- Inspect the power supply to ensure it's receiving electricity and that the circuit breaker hasn't tripped.
- Contact a licensed HVAC technician to diagnose and repair the issue, as opening the water heater or tampering with its electrical components can be dangerous.
How to Reset Rinnai Code 32
- 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 32 Mean?
The Rinnai 32 error code signifies that the outlet thermistor, a temperature-sensing component, has failed. This part is responsible for monitoring the water temperature at the outlet. When it malfunctions, your water heater may not heat water correctly or at all, leading to cold showers or other inconveniences. In some cases, the heater may overheat, potentially causing water damage or other issues.
Common Causes
- Wiring issues or corrosion in the thermistor's electrical connections
- Damage to the thermistor due to excessive heat or age
- Incorrect wiring during installation or previous repairs
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Water heater is not producing hot water | Measure the resistance of the outlet thermistor using a multimeter. It should be between 5,000 to 15,000 ohms at 77°F (25°C). | A reading outside this range indicates a faulty thermistor. |
| Water heater is overheating | Inspect the wiring and connections to the outlet thermistor for any signs of damage, corrosion, or incorrect wiring. | No visible damage or incorrect connections. |
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 |
|---|---|---|---|
| Outlet Thermistor | RIN-1000100000 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Rinnai model families as 32.
| 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 |