FieldBench
Goodman codes

Goodman

3 flash

Lockout

PS open

Metal-vent draft not proven.

Walk 3 flash in Diagnose

5 plates — walk the one on the cabinet

First check

1 Prove inducer and the live code

Do not pull power — that clears the Goodman GMS80 active code. Write 3 flash. Is the inducer spinning on this call? Silent inducer is not a pressure switch. Cap, liner, common-vent tables, inducer wheel.

Expect: 120 VAC at the inducer on a heat call. Wheel turning.

If fail: 120 VAC missing → IFC / door switch / incoming power. Voltage + dead motor → inducer.

If pass: Inducer running + this code → trap, hose, switch, vent (step 2).

The rest of the walkthrough is Diagnose.

On the plates

  • Trap and collector first — these 96%s drown overnight.
  • Inducer 120 VAC and spinning. Hose on the only collector tap.
  • PVC intake/exhaust, bird screen, ice, wind.
  • Trap and collector first. 92% still makes condensate.
  • Inducer 120 VAC, hose on the only tap, PVC termination.
  • Cap, liner, common-vent tables, inducer wheel.
  • PS hose on the inducer housing — flue condensate on a long metal run, not a 96% collector.
  • Do not cut a PVC trap that does not exist.

Plates that use 3 flash

Same number, other makers

3 flash on Goodman is not the same code on these plates.