Rheem Error Code A001: Ignition Failure
Warning: Your Rheem HVAC system has encountered an ignition failure. It's safe to operate, but it needs professional attention.
How to Fix Rheem Code A001
- Step 1: Turn off your HVAC system at the thermostat.
- Step 2: Check if the error persists after turning the system back on. If it does, it's time to call a professional.
- Step 3: In the meantime, ensure the area around your HVAC unit is clear and well-ventilated.
How to Reset Rheem Code A001
- 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 Rheem Error Code A001 Mean?
The A001 error code on your Rheem HVAC system indicates that the ignition system isn't functioning correctly. This could be due to a faulty ignition control module, a problem with the igniter, or an issue with the gas valve. The system is designed to protect itself from potential hazards, so it's displaying this error and may not be operating at full capacity.
Common Causes
- Faulty ignition control module
- Defective igniter
- Problem with the gas valve
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| The system is not igniting at all | Inspect the igniter for any visible damage or signs of wear | A clean, undamaged igniter |
| The igniter glows but the system doesn't light | Measure the voltage at the igniter terminals using a multimeter | 120V AC |
Applicable Rheem Models
- NCB(gas)
- NPE(electric)
- R801T(gas)
- R92E(electric)
- R92V(gas)
- RGE(gas)
- RH2T(electric)
- RNC(dual_fuel)
- RNE(electric)
- RNG(gas)
- RP16(electric)
- RPB(gas)
- RTGH(gas)
- Rheem Classic(gas)
- Rheem Classic 80 Plus(gas)
- Rheem Classic 80% Gas Furnace(gas)
- Rheem Classic 90 Plus(gas)
- Rheem Classic Plus Series(gas)
- Rheem Classic Series(dual_fuel)
- Rheem Prestige(gas)
- Rheem Prestige 95% Gas Furnace(gas)
- Rheem Prestige Series(gas)
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Ignition Control Module | RHEEM 357090 | — | Find Part |
| Igniter | RHEEM 357080 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Rheem model families as A001.
| Code | Description | Severity |
|---|---|---|
| A021 | Over-Temperature | Warning |
| A031 | Inlet Thermistor Open/Short | Warning |
| A041 | Outlet Thermistor Open/Short | Warning |
| A043 | Water Level Error | Warning |
| A051 | Fan Motor Abnormality | Warning |
| A052 | Fan Motor Speed Error | Warning |
| A053 | Fan Motor Open Circuit | Warning |
| A054 | Fan Motor Overcurrent | Warning |
| A055 | Fan Motor Locked | Warning |
| A095 | DIP Switch Error | Warning |