Goodman · Furnace

d4 Memory card data rejected

Medium severity Goodman/Amana *MVC95/*CVC9 two-stage ComfortNet

What the control is telling you

The control rejected the shared data on the memory card. The furnace may run wrong or not at all. ComfortNet thermostat shows INVALID MC DATA d4.

Applies to: GMVC95/AMVC95 upflow and *CVC9 counterflow two-stage furnaces

Likely causes

Memory card is for a different model

Test and repair steps

Safety turn power off before working on the control or wiring.
Check the memory card matches the furnace model.
Reload using the correct card insert with power off, then power on.
Turn power off before removing the card. The code clears once good data loads.

Settings for these units

Normal status displays (7-segment) · Goodman/Amana GM9S96/AM9S96
Normal status displays (7-segment) · Goodman/Amana GM9S80/AM9S80
Normal status displays (7-segment) · Goodman/Amana GM9C96/AM9C96
Minimum recommended filter size · Goodman/Amana GM9C96/AM9C96

Models that show this code

10 models in Goodman/Amana *MVC95/*CVC9 two-stage ComfortNet

GCVC90704CXGCVC90905DXGCVC91155DXGCVC950714CXGCVC950915DXGMVC950453BXGMVC950704CXGMVC950905CXGMVC950905DXGMVC951155DX

Other codes on the same units

b9 Low indoor airflow
C1 Low-stage cooling
C2 High-stage cooling
d0 No shared data on the control
E0 Lockout - ignition failed 3 times
E1 Low-stage pressure switch closed at start of heat
E2 Low-stage pressure switch will not close
E3 High limit or rollout limit open

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Source: Goodman *CVC9/95 & *MVC95 Installation Instructions IO-341D (08/2010), Troubleshooting Chart p.53-57. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.