Rheem Error Code A055: Fan Motor Locked
Warning: Your Rheem HVAC system has detected a fan motor issue and has locked out for safety.
How to Fix Rheem Code A055
- Check for and remove any obstructions around the fan blades or motor
- Inspect the fan motor and its wiring for any visible damage or loose connections
- If the issue persists, contact a professional HVAC technician for further diagnosis and repair
How to Reset Rheem Code A055
- 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 A055 Mean?
The Rheem A055 error code indicates that your system's fan motor has locked up, preventing it from running. This could be due to an obstruction, a faulty motor, or an issue with the motor's control circuit. The system has automatically shut down to prevent damage or fire hazard. Do not attempt to restart the system until the issue is resolved.
Common Causes
- Obstruction in the fan blades or motor
- Faulty fan motor
- Issue with the motor's control circuit
- Wiring problem or loose connection
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Fan motor is making a grinding or squealing noise | Inspect the fan motor and blades for signs of damage or obstruction | No visible damage or obstruction |
| Fan motor is not spinning when the system is in 'On' mode | Measure the voltage at the fan motor's terminals using a multimeter | 24V AC (or 120V AC for some models) when the system is in 'On' mode |
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 |
|---|---|---|---|
| Fan Motor Assembly | RHEEM 388368 | — | Find Part |
| Control Circuit Board | RHEEM 388369 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Rheem model families as A055.
| Code | Description | Severity |
|---|---|---|
| A001 | Ignition Failure | Warning |
| 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 |
| A095 | DIP Switch Error | Warning |