Ruud U96VA0702317MSA Error Code d6: Horsepower Conflict on Memory Card
What Does Code d6 Mean?
A d6 code on the Ruud U96VA0702317MSA indicates a horsepower mismatch between the installed blower motor and the model data stored on the memory card at connector P6. The motor reports its HP rating to the IFC, which compares it against the HP specification on the card. When these do not match, d6 is displayed. However, the model data stored directly on the IFC microprocessor does match the installed motor, so the furnace continues to operate normally. The d6 code only appears during standby mode.
This fault most commonly follows a service call where either the blower motor was replaced with a different HP rating, or the memory card or IFC board was replaced using a part from a different model in the U96V series. Different BTU configurations within this product family use different blower motor sizes, so substituting components between models can create this HP conflict. While the furnace keeps running, the mismatch represents a parts discrepancy that should be corrected.
Running long-term with a motor HP that does not match the model specifications can cause improper airflow volumes, insufficient heat exchanger cooling, and potential damage. A technician should verify that both the installed motor and memory card are the correct parts for this specific U96VA0702317MSA model number.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Blower motor or control board recently replaced with wrong part | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- No immediate service needed since operation continues normally — but schedule service to verify the blower motor and memory card both match the U96VA0702317MSA specifications, since a parts mismatch can affect airflow and heat exchanger performance over time
✓ Verified against manufacturer service manual — March 2026