Goodman five flashes: flame sensed when no flame should exist

What Does Error 5 flashes Mean?

Five flashes on a Goodman integrated control reports flame sensed when there was no call for heat and the gas valve should have been closed. The control is describing gas burning outside the sequence it commanded, which is why the response is to shut down and involve a licensed engineer rather than to reset and observe. Applies to: Goodman GMVC-series two-stage variable-speed gas furnaces documented in the installation and operating instructions What follows is scoped to GMVC-series equipment and the flash table Goodman prints for it. Other Goodman control generations, and related brands built on similar boards, assign this count differently, so the diagnostic label fixed inside your own furnace door is the authority rather than any chart found elsewhere. Owner-safe checks: Check for any smell of gas indoors, and if one is present leave the property and use the emergency number your gas supplier publishes before doing anything else. | Switch the furnace off at its dedicated service switch so the control stops attempting cycles. | Note whether you actually saw or heard burner activity, or whether only the code was present, and record the time. Qualified technician: A gas valve that does not seat, a burner alight outside its commanded sequence, and flame sensing circuit faults are licensed gas engineering work without exception. | Do not operate, reset, or test the furnace to see whether the code returns. The condition being reported is combustion the control did not ask for.

Other Common Goodman furnace — Goodman GMVC-series two-stage variable-speed gas furnaces documented in the installation and operating instructions Error Codes