Rinnai Error Code 10: Air Supply/Exhaust Blockage
Warning: Your Rinnai water heater has detected a potential blockage in the air supply or exhaust system. This could lead to unsafe conditions if not addressed.
How to Fix Rinnai Code 10
- Check the air intake and exhaust vents for any visible blockages. If you find any, try to gently remove them using a vacuum or soft brush.
- Replace the air filter if it's dirty or clogged.
- If the issue persists, it's best to call a professional HVAC technician to diagnose and fix the problem.
How to Reset Rinnai Code 10
- 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 10 Mean?
The Rinnai 10 error code indicates that your water heater has sensed a restriction in the airflow to its combustion chamber or exhaust vent. This could be due to a blockage caused by lint, dust, or other debris. If left unchecked, this could lead to a buildup of carbon monoxide, a hazardous gas that can be deadly in high concentrations. It's important to address this issue promptly to ensure the safety of your home and family.
Common Causes
- Blockage in the air intake or exhaust vent due to lint, dust, or other debris
- Faulty draft inducer fan
- Clogged air filter
- Incorrect venting configuration
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| The draft inducer fan is running | Measure the fan's RPM using a tachometer | RPM should match the manufacturer's specifications |
| The air filter is clogged | Replace the air filter with a new one | Airflow should improve after replacing the filter |
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 |
|---|---|---|---|
| Air Filter | RIN-1000012500 | — | Find Part |
| Draft Inducer Fan | RIN-1000013500 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Rinnai model families as 10.
| Code | Description | Severity |
|---|---|---|
| 02 | Stagnant Water Detection | 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 |
| 32 | Outlet Thermistor Failure | Warning |