Rinnai Error Code 41: Exhaust Temperature High
Warning: Your Rinnai heater has detected an unsafe exhaust temperature. Turn off the unit and call a professional for repair.
How to Fix Rinnai Code 41
- Step 1: Turn off the heater at the thermostat and the main gas valve.
- Step 2: Do not attempt to open the heater or inspect the venting system yourself.
- Step 3: Contact a professional Rinnai technician for a safe and thorough inspection.
How to Reset Rinnai Code 41
- 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 41 Mean?
Error code 41 on your Rinnai heater indicates that the exhaust temperature has exceeded the safe limit. This could be due to a blockage in the venting system, a faulty temperature sensor, or a problem with the heat exchanger. It's crucial to address this issue promptly to prevent potential damage to your heater and ensure safe operation.
Common Causes
- Blockage in the venting system
- Faulty exhaust temperature sensor
- Problem with the heat exchanger
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| The venting system is blocked | Measure the static pressure of the blower motor | Higher than normal (over 1.5" W.C.) |
| The exhaust temperature sensor is faulty | Test the sensor using a multimeter | Open or short circuit |
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 |
|---|---|---|---|
| Exhaust Temperature Sensor | R200000020 | — | Find Part |
| Venting System | — | — | — |
Related Codes on Same Models
Other codes that affect the same Rinnai model families as 41.
| 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 |