Rheem R96VA0702317MSA Error Code d4: No Valid Model Data on Memory Card
What Does Code d4 Mean?
Every time the Rheem R96VA0702317MSA control board powers on, it reads model-specific configuration data from a removable memory card at connector P6. This data tells the control how to operate the variable-speed ECM blower at the correct speeds for this model's specific BTU rating. When the card cannot be read — because it is corrupt, blank, wrong, or absent — the board logs code d4 and falls back to a secondary copy of the model data already stored in the IFC microprocessor. The furnace continues operating normally across all modes; d4 only appears during standby and does not interrupt heating, cooling, or fan operation.
The distinction between d4 and the more serious d1 code is that d1 means the IFC has no usable model data anywhere, while d4 means the card is unreadable but the microprocessor still has what it needs to run. d4 is essentially a data-redundancy warning rather than an operational fault.
Common causes include a corrupted card from age or a power event, a blank card from a different model accidentally installed, a card not seated fully in connector P6, or no card present at all. A technician should replace the card at connector P6 with the correct one for the R96VA0702317MSA. Using a card from a different model could cause the blower to run at incorrect speeds and potentially reduce heat exchanger life.
Common Causes
When to Call a Professional
Contact a licensed HVAC technician if:
- No professional service is needed immediately since the furnace operates normally with d4 — but schedule service to have the memory card replaced with the correct one for this model before a future control board replacement makes it necessary
- A technician should verify the replacement card matches this specific model number to avoid inadvertently loading incorrect motor data
✓ Verified against manufacturer service manual — March 2026