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Goodman gas furnace code EF: Condensate blockage
Gas furnace, Canada and United States
This code means one of two things, depending on your model. Find your model family below, then read the section for it. The model number is on the rating label on the side of the unit.
Find your model family
| If you have | It means |
|---|---|
| GMVC8 / GCVC8 / AMVC8 / ACVC8, GMVC96 / GCVC96 / AMVC96 / ACVC96 | Auxiliary switch open (high water in the coil drain pan) |
| GMVM96 / GCVM96 / AMVM96 / ACVM96, GMVM97 / GCVM97 / AMVM97 / ACVM97 | Auxiliary input open (float switch or missing jumper) |
Auxiliary switch open (high water in the coil drain pan)
On GMVC8 / GCVC8 / AMVC8 / ACVC8, GMVC96 / GCVC96 / AMVC96 / ACVC96.
The auxiliary switch input is open because the water level in the evaporator coil drain pan is high.
This needs an HVAC technician. There is nothing safe to check yourself. Leave the covers on and book a professional.
Water may be leaking. Turn off the water supply to the unit if you see a leak.
What causes it
-
High water in the evaporator coil drain pan. A technician checks the overflow pan and services the drain.
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 an HVAC technician
Book a licensed air conditioning technicianHVAC technician
- Do not open any panels. Refrigerant circuits must only be opened by a licensed technician.
- Note the code, which unit shows it (indoor or outdoor), and the model numbers of both units.
- Book a licensed air conditioning technician and give them those details.
Models that show this code
52 models in 2 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 |
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
Checked against the manufacturer's manual on 14 October 2026.
Auxiliary input open (float switch or missing jumper)
On GMVM96 / GCVM96 / AMVM96 / ACVM96, GMVM97 / GCVM97 / AMVM97 / ACVM97.
The auxiliary input on the control board is open, 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.
Water may be leaking. Turn off the water supply to the unit if you see a leak.
What causes it
-
An open circuit between the aux in and aux out terminals.
-
The jumper across the auxiliary input is missing.
-
A float switch on the auxiliary input has opened. A technician inspects it.
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 and a blank display means the board has no power. 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
14 models in 2 ranges
| Range | Models |
|---|---|
| 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
- GMVM97/GCVM97 (revision AA) modulating gas furnace installation instructions (IOG-2007H) , page 54
- GMVM96/GCVM96 modulating gas furnace installation instructions (IO-406E) , page 53
Checked against the manufacturer's manual on 15 October 2026.
Other Goodman gas furnace codes
| Code | Meaning | What you can do |
|---|---|---|
| EEE | Internal control board fault | Call a pro |
| EEF | Auxiliary (condensate) switch open | Call a pro |
| EEH | Twinning error | Call a pro |
| EEJ | Inducer relay error | Call a pro |
| EEL | Igniter circuit problem | Call a pro |
| EEn | Igniter open | Call a pro |
| IdL | Idle, normal operation | You can often fix it |
| IF | Internal control board fault | Call a pro |
| 1 amber flash | Low-stage heat call | You can often fix it |
| 2 amber flashes | High-stage or single-stage heat call | You can often fix it |
| 3 amber flashes | Second-stage heat call without first stage | Safe checks first, then a pro |
| 4 amber flashes | Cooling call without a fan signal | Safe checks first, then a pro |