GOODMAN DIAGNOSTIC REFERENCE DUAL 7-SEGMENT DISPLAY (TWO-STAGE VARIABLE-SPEED) DOC GOODMAN-D4

Goodman furnace: Invalid Memory Card Data (d4)

Q: What does d4 mean on a Goodman furnace?

Invalid Memory Card Data (d4). The control rejected the shared data set — memory cards are model-specific and a card for a different model will be refused.

d4 YOUR LIGHT: DISPLAY CODE D4 — MATCH IT ABOVE

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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.

See what causes this code ↓ Get repair quotes near you

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.

Goodman furnace replacement parts

Search by your model number (on the blower-door label) for an exact match

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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.

Verified against Goodman GMVC96/GCVC96 Service Manual, p.44

Last verified 2026-07-06 · how we verify

Related Goodman fault codes

These codes use the same dual 7-segment display (two-stage variable-speed) system.

Pattern	Meaning
b0	ECM Blower Motor Not Running (b0)
d0	No Shared Data (d0)
b1	ECM Motor Communications Lost (b1)
EA	Reversed Line Polarity (EA)

See all Goodman furnace fault codes →