Goodman · Furnace

88 Power-up self check

Normal status Goodman/Amana *MVC95/*CVC9 two-stage ComfortNet

What the display is showing

Both digits show 8 for a moment when power is applied while the control runs its internal checks. It then changes to OP.

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

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

b0 Blower motor not running
b1 Lost communication with blower motor
b2 Blower motor size does not match model data
b3 Blower motor limiting (power, temperature or speed)
b4 Blower motor trip (lost rotor control or high current)
b5 Blower motor locked rotor
b6 Blower motor over/under voltage or over temperature
b7 Blower motor missing parameters

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Source: Goodman *CVC9/95 & *MVC95 Installation Instructions IO-341D (08/2010), Operational Checks p.48. Summarized in our own words; check the original manual for your model.

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.