Goodman EF Error Code: Condensate (AUX) switch open
Updated October 2026 · Sourced from Goodman documentation
🧭 Check a few things first
The auxiliary switch wired to the condensate switch is open. The manual lists a high water level in the evaporator coil drain pan or auxiliary drain pan.
Is it safe to keep running? Check the steps below first. If water keeps backing up, call a licensed technician to clear the drain and check the coil pan.
EF at a glance
| Code / how it shows | Meaning | Applies to |
|---|---|---|
| EF Also: EEF Three-digit 7-segment display shows EEF | Condensate (AUX) switch open | Goodman GMVC96 / Amana AMVC96 / GCVC96 / ACVC96 34.5-inch chassis two-stage gas furnaces |
Check this first
Only steps a homeowner can do safely. Do not open electrical panels or the burner area.
- Look at the condensate drain line and trap (if you can see it without removing any panel) for a clog, kink or standing water.
- Look at the drain pan under the indoor coil, if you can see it without removing a panel, for standing water.
- Turn the furnace power off at the switch or breaker, wait one minute, then turn it back on to see whether the code returns.
🛑 Stop and call a licensed pro if
- If water keeps backing up, call a licensed technician to clear the drain and check the coil pan.
- You smell gas. Leave the house, do not touch switches, and call your gas utility from outside.
- Flame rollout, limit or pressure switch codes that come back after one reset.
- Anything involving the control board, gas valve, flame sensor, igniter or venting.
- A carbon monoxide alarm sounds. Get everyone outside and call 911 or the fire department.
Safe first steps for any Goodman code
- Count the LED flashes through the blower door window before you switch anything off. Cutting power can clear the code.
- Replace or clean the furnace air filter.
- Check the thermostat: correct mode, set above room temperature, and fresh batteries.
- Make sure the furnace power switch and breaker are on. If the furnace has locked out, turning the power off and back on once restarts it.
- Make sure the gas valve is in the ON position, following the lighting instructions on the furnace label only.
- On high-efficiency furnaces, look at the outside vent and intake pipes for snow, ice, leaves or nests (look only, do not take pipes apart).
Source: Goodman 34.5 in. Chassis ACVC96/AMVC96/GCVC96/GMVC96 Service and Troubleshooting RS6612023R2, p.44. Codes are series-specific, so your unit's own manual is the final word. Reviewed October 2026.
Shaun Cain · Certified HVAC & Refrigeration Technician · Ask an HVAC technician
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