Goodman furnace code d4: Invalid Memory Card Data
Professional repair
What does d4 mean on a Goodman furnace? The control rejected the shared data set — memory cards are model-specific and a card for a different model will be refused.
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
Obtain the card matching your model number from the distributor.
What causes it (in order of likelihood)
- Wrong memory card for this furnace model TECH
Parts for this code
No specific part number is verified for this code — it typically points at wiring, power, a blown fuse, or communication between components rather than one standard replacement part. If your diagnosis does land on a replaceable component, match its part number against your model's parts list before ordering.
Questions about this code
What does d4 mean on a Goodman furnace?
The control rejected the shared data set — memory cards are model-specific and a card for a different model will be refused.
How do I fix Goodman furnace code d4?
Cards are model-specific, so a card for another model is refused. There's nothing for a homeowner to adjust; a technician needs a card matching your model number.
How much does it cost to fix Goodman furnace code d4?
Cost depends on obtaining the correct card from a distributor and the visit time. If someone recently installed the wrong card, ask them about correcting it.
Applies to
GMVC96 · GCVC96
Different Goodman generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Same control platform, same code: Amana furnace code d4
Verified against Goodman GMVC96/GCVC96 Service Manual, p.44
Last verified 2026-07-06 · page updated 2026-10-03 · how we verify
Related Goodman furnace codes
These codes use the same dual 7-segment display (two-stage variable-speed) system.
| Pattern | Meaning |
|---|---|
| b0display b0 | ECM Blower Motor Not Running (b0) |
| d0display d0 | No Shared Data (d0) |
| b1display b1 | ECM Motor Communications Lost (b1) |
| EAdisplay EA | Reversed Line Polarity (EA) |