FieldBench
Goodman codes

Goodman

Fan prove

Lockout

Indoor fan proving

Controller did not see blower current / pressure.

Walk Fan prove in Diagnose

Sign in for the next measurement

First check

1 Write the live code and watch one cycle

On Goodman GPG16 read Packaged IFC / IGC + contactor before you pull power. Write Fan prove exactly. Watch one full sequence and note which step dies. Belt off, ECM alarm, or current switch around the wrong lead.

Expect: Call: Occupied / G starts the indoor fan. Y1 is cool. W is gas heat. They are different boards in the same box.

The rest of the walkthrough is Diagnose.

On the plates

  • Belt off, ECM alarm, or current switch around the wrong lead.
  • VFD in limp mode on some Trane/VFD cabinets will not make the prove switch.
  • Do not jumper fan-prove and walk away — heat will fire into a dead blower.

Plates that use Fan prove

Same number, other makers

Fan prove on Goodman is not the same code on these plates.