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Goodman gas furnace code E8: High-stage pressure switch closed at start of heating
Gas furnace, Canada and United States
At the start of a heating cycle the high-stage pressure switch circuit was already closed. The furnace runs on low stage only.
This needs a licensed gas technician. There is nothing safe to check yourself. Leave the covers on and book a professional.
This involves the flue or exhaust. A blocked or leaking flue can let carbon monoxide into the home.
What causes it
-
The high-stage pressure switch contacts are sticking closed. The switch is replaced.
-
A short in the pressure switch wiring.
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 |
|---|---|---|
| E1 | Low-stage pressure switch closed at start of heating | Call a pro |
| E2 | Low-stage pressure switch not closing | Safe checks first, then a pro |
| E9 | High-stage pressure switch not closing | Safe checks first, then a pro |
| EE1 | Pressure switch closed at start of heating | Call a pro |
| EE2 | Pressure switch not closing | Call a pro |
| EE8 | High-stage pressure switch closed at start of heating | Call a pro |
| EE9 | High-stage pressure switch not closing | Call a pro |
| 2 red flashes | Pressure switch closed when it should be open | Call a pro |
| 3 red flashes | Pressure switch not closing | Safe checks first, then a pro |
| 3 double red flashes | High-stage pressure switch stuck open | Call a pro |
| 6 red flashes | Overheat / flue or venting fault (depends on model) | Depends on your model |
| 12 red flashes | Flue or venting fault / ignition failure (depends on model) | Call a pro |
See all flue or venting fault codes on gas furnaces across brands.