FieldBench
Goodman codes

Goodman

5 flash

Hazard

Flame with valve off

Leaking valve or false flame sense.

Walk 5 flash in Diagnose

Sign in for the next measurement

First check

1 Shut the gas cock first

On Goodman GMSS96 the rod sees flame with the valve de-energized. Shut the cock. If flame stays, the valve is leaking — replace it. Do not jump or energize it as a test. Shut the gas cock. If flame stays, replace the valve.

Expect: Flame dies when the cock is shut.

If fail: Leaking valve. Replace. Do not leave the unit.

The rest of the walkthrough is Diagnose.

On the plates

  • Shut the gas cock. If flame stays, replace the valve.
  • Rod shorted to ground.

Plates that use 5 flash

Same number, other makers

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