Ruud U802VA050317MSA Error Code A002_F: Blower Coefficient Configuration Error
What Does Code A002_F Mean?
Fault code A002_F on the Ruud U802VA indicates that the IFC board has detected a blower coefficient configuration error — the blower motor's performance coefficients are not properly configured. These coefficients define how the control board calculates motor commands to achieve target airflow rates for heating, cooling, and continuous fan modes.
The U802VA uses a Bluetooth communicating IFC, and the blower coefficients must be written to the board using the manufacturer's contractor app. Without these values, the IFC cannot accurately control the blower motor to deliver the designed airflow volumes, which affects both heating performance and system safety.
This is an active (A) fault indicating the condition is currently present. Like all lockout conditions on the U802VA, power cycling will clear the lockout attempt but will not resolve the underlying issue. A technician must complete the full Bluetooth programming sequence — including blower coefficient entry — before the furnace can operate correctly.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Control board replacement without proper configuration | Most 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 program blower coefficients in addition to model data before the furnace will function correctly
- If the fault recurs after programming, a technician should verify the correct coefficient values for this specific U802VA model are being used
✓ Verified against manufacturer service manual — March 2026