GOODMAN DIAGNOSTIC REFERENCE MODULATING FURNACE (GMVM97) — DUAL 7-SEGMENT DISPLAY DOC GOODMAN-GMVM97-EF

Goodman furnace: Open Auxiliary Input (EF)

Q: What does EF mean on a Goodman GMVM97 furnace?

Open Auxiliary Input (EF). The auxiliary input circuit is open — an external safety device wired into AUX (condensate overflow switch, etc.) has tripped.

EF YOUR LIGHT: DISPLAY CODE EF — MATCH IT ABOVE

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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.

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.

1Check: Tripped external safety (often a full condensate pan/float switch)

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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

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 GMVM97-Service, p.64

Last verified 2026-07-06 · how we verify