Rheem R802VA07542117MSA Error Code A002_F: Blower Coefficient Configuration Error
What Does Code A002_F Mean?
Fault code A002_F on the Rheem R802VA indicates that the IFC board has detected invalid or absent blower coefficient data. The R802VA uses a constant CFM/PWM blower motor whose speed is calculated from mathematical coefficients stored in the IFC. These coefficients define the precise relationship between the requested airflow and the motor command signal.
Without correct blower coefficients, the IFC cannot accurately control the ECM (electronically commutated motor) blower, meaning airflow for heating, cooling, and continuous fan modes would all be incorrect or the blower would not run at all. As a result, the board locks out with A002_F.
This fault most commonly occurs after a control board replacement when the replacement board has not been fully programmed through the Bluetooth contractor app. It can also occur if a blower motor replacement involved an incompatible motor that requires different coefficient values.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Replacement control board missing blower coefficient data | Most common | ✗ Call a pro → |
| Blower motor replacement with incompatible coefficients | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Any time this code appears — blower coefficient programming requires the manufacturer's Bluetooth contractor app and a qualified HVAC technician
- After a control board replacement, a technician must complete blower coefficient programming before the furnace can operate
- After a blower motor replacement, a technician must verify that the new motor's coefficients match what is programmed in the IFC
✓ Verified against manufacturer service manual — March 2026