Rheem R96VA0702317MSA Error Code d6: Horsepower Conflict on Memory Card
What Does Code d6 Mean?
A d6 code on the Rheem R96VA0702317MSA is a non-critical fault indicating a horsepower mismatch between the installed blower motor and the model data on the memory card at connector P6. The motor reports its HP rating to the IFC, which compares it against the HP specification stored on the memory card. When there is a discrepancy, d6 is displayed. Importantly, the model data stored directly on the IFC microprocessor does match the installed motor, so the furnace continues to operate normally. The d6 code appears only during standby mode.
This fault most commonly appears after a service call where either the blower motor was replaced with a unit of a different HP rating, or the memory card or control board was replaced with one from a different model. The two-stage ECM blower used in this furnace family comes in different HP ratings depending on the BTU capacity and airflow requirements of each model, so substituting parts from different models can produce this mismatch.
While the furnace continues to operate with d6 active, the underlying parts mismatch should be corrected. Running with a motor that does not match the model's specifications can result in improper airflow, insufficient heat exchanger cooling, and potential long-term damage. A technician should verify that both the installed motor and memory card are the correct parts for this specific model.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Blower motor recently replaced with wrong horsepower motor | Most common | ✗ Call a pro → |
| Memory card or furnace control recently replaced with wrong card | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- No immediate action needed since the furnace operates normally — but schedule service to verify the installed blower motor and memory card both match the R96VA0702317MSA specifications, as a parts mismatch can cause improper airflow and heat exchanger stress
✓ Verified against manufacturer service manual — March 2026