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Goodman gas furnace code EA: Reversed polarity or poor ground
Gas furnace, Canada and United States
The 115 V supply polarity is reversed or the furnace is poorly grounded, and the furnace does not run.
This needs a licensed gas technician. There is nothing safe to check yourself. Leave the covers on and book a professional.
What causes it
ComfortNet two-character display (GMVC96 revision AA, GMVC8)
-
The 115 V supply to the furnace or control board is connected with its polarity reversed.
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A poor unit ground.
ComfortNet two-character display, modulating furnaces (GMVM97 revision AA, GMVM96)
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The 115 V supply to the furnace or control board is connected with its polarity reversed.
-
The unit ground is reversed.
How to read this code on your unit
The code shows on the two-character display on the furnace control board, which you can see through the sight glass on the blower compartment. On means normal operation. A blank display means the board has no power or has failed. A ComfortNet thermostat, if fitted, shows the same codes with a short message and uses EE for an internal fault.
Booking a licensed gas technician
Book a licensed gas technicianlicensed gas technician
- Turn the unit off and leave the covers on. Gas components must only be serviced by a licensed technician.
- Note the code, how often it appears, and the model and serial numbers from the rating label.
- Book a licensed gas technician and give them those details.
Models that show this code
66 models in 4 ranges
| Range | Models |
|---|---|
| GMVC8 / GCVC8 / AMVC8 / ACVC8 | GMVC80603BN, GMVC80603BX, GMVC80604BN, GMVC80604BX, GMVC80803BN, GMVC80803BX, GMVC80804CN, GMVC80804CX, GMVC80805CN, GMVC80805CX, GMVC80805DN, GMVC80805DX, GMVC81005CN, GMVC81005CX, AMVC80603BN, AMVC80603BX, AMVC80604BN, AMVC80604BX, AMVC80803BN, AMVC80803BX, AMVC80804CN, AMVC80804CX, AMVC80805CN, AMVC80805CX, AMVC80805DN, AMVC80805DX, AMVC81005CN, AMVC81005CX |
| GMVC96 / GCVC96 / AMVC96 / ACVC96 | GMVC960403BN, GMVC960603BN, GMVC960803BN, GMVC960804CN, GMVC961005CN, GMVC961005DN, GMVC961205DN, GCVC960403BN, GCVC960603BN, GCVC960804CN, GCVC961005CN, GCVC961205DN, AMVC960403BN, AMVC960603BN, AMVC960803BN, AMVC960804CN, AMVC961005CN, AMVC961005DN, AMVC961205DN, ACVC960403BN, ACVC960603BN, ACVC960804CN, ACVC961005CN, ACVC961205DN |
| GMVM96 / GCVM96 / AMVM96 / ACVM96 | GMVM960603BX, GMVM960805CX, GMVM961005DX, GMVM961155DX |
| GMVM97 / GCVM97 / AMVM97 / ACVM97 | GMVM970603BN, GMVM970803BN, GMVM970804CN, GMVM971005CN, GMVM971205DN, AMVM970603BN, AMVM970803BN, AMVM970804CN, AMVM971005CN, AMVM971205DN |
Where this comes from
- GMVC96/GCVC96 (revision AA) ComfortNet gas furnace installation instructions (IOG-2008H) , page 54
- GMVC8/GCVC8 ComfortNet gas furnace installation instructions (IOG-2012C) , page 43
- GMVM97/GCVM97 (revision AA) modulating gas furnace installation instructions (IOG-2007H) , page 55
- GMVM96/GCVM96 modulating gas furnace installation instructions (IO-406E) , page 54
Checked against the manufacturer's manual on 13 October 2026.
Other Goodman gas furnace codes
| Code | Meaning | What you can do |
|---|---|---|
| E10 | Grounding fault or poor neutral connection | Call a pro |
| E16 | External return air sensor circuit shorted | Call a pro |
| E17 | Supply air sensor circuit open | Call a pro |
| E18 | Supply air sensor circuit shorted | Call a pro |
| E19 | Onboard return air sensor unplugged | Call a pro |
| EA0 | R-32 refrigerant leak detected | Safe checks first, then a pro |
| EA1 | R-32 refrigerant sensor fault | Safe checks first, then a pro |
| EA2 | A2L relay fault on the control board | Safe checks first, then a pro |
| EAF | Lost communication with the R-32 refrigerant sensor | Safe checks first, then a pro |
| EEA | Reversed polarity or poor ground | Call a pro |
| 9 red flashes | Configuration error or electrical fault (depends on model) | Call a pro |
| red light flashing rapidly | Electrical fault or configuration error (depends on model) | Call a pro |
See all electrical fault codes on gas furnaces across brands.