Goodman GMVM97 furnace code EF: Open Auxiliary Input
Professional repair
What does EF mean on a Goodman GMVM97 furnace? The auxiliary input circuit is open — an external safety device wired into AUX (condensate overflow switch, etc.) has tripped.
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.
Try these first — in this order
Check the condensate pump/float switch — empty and reset.
If no external device tripped, the circuit needs tracing.
What causes it (in order of likelihood)
- Tripped external safety (often a full condensate pan/float switch) DIY-CHECKABLE
Parts for this code
No specific part number is verified for this code — it typically points at wiring, power, a blown fuse, or communication between components rather than one standard replacement part. If your diagnosis does land on a replaceable component, match its part number against your model's parts list before ordering.
Questions about this code
What does EF mean on a Goodman GMVM97 furnace?
The auxiliary input circuit is open — an external safety device wired into AUX (condensate overflow switch, etc.) has tripped.
How do I fix Goodman GMVM97 furnace code EF?
You can look for visible water around the furnace or pump. Emptying, resetting, or tracing the circuit is technician work.
How much does it cost to fix Goodman GMVM97 furnace code EF?
Cost depends on which device tripped and why, such as a full condensate pan or a circuit fault. A technician's inspection determines the work needed.
Applies to
GMVM97
Different Goodman generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Verified against Goodman GMVM97 Service Manual, p.64
Last verified 2026-07-06 · page updated 2026-10-03 · how we verify
Related Goodman furnace codes
These codes use the same modulating furnace (gmvm97) — dual 7-segment display system.
| Pattern | Meaning |
|---|---|
| b0display b0 | Blower Motor Not Running (b0) |
| EEdisplay EE | Improper Wiring to the Furnace (EE) |
| b1display b1 | Blower Communication Error (b1) |
| ECdisplay EC | Inducer Motor Overcurrent (EC) |