Rinnai Error Code 16: Over-Temperature
Warning: Your Rinnai water heater has detected an overheating condition, which may cause damage to the unit if not addressed.
How to Fix Rinnai Code 16
- Check if the water supply valves are fully open
- Inspect the water inlet and outlet for any signs of restriction or clogging
- If the issue persists, contact a professional HVAC technician
How to Reset Rinnai Code 16
- 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 16 Mean?
Error code 16 on your Rinnai water heater indicates that the temperature has exceeded the safe operating range. This could be due to a faulty temperature sensor, a problem with the heating element, or an issue with the water flow rate. It's important to address this issue promptly to prevent further damage to your water heater.
Common Causes
- Faulty temperature sensor
- Problem with the heating element
- Issue with the water flow rate
- Clogged or restricted water inlet
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Water heater is not producing hot water | Temperature at the water heater's inlet and outlet | Inlet: cold, Outlet: hot |
| Water heater is producing hot water | Temperature at the water heater's outlet | Below 180°F (82°C) |
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 |
|---|---|---|---|
| Temperature Sensor | RIN-100145800 | — | Find Part |
| Heating Element | RIN-100145700 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Rinnai model families as 16.
| 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 |
| 19 | Electrical Grounding | Warning |
| 25 | Condensate Overflow | Warning |
| 29 | Condensate Neutralizer | Warning |
| 31 | Inlet Thermistor Failure | Warning |
| 32 | Outlet Thermistor Failure | Warning |