Goodman · Furnace
Goodman GMSS9 / GCSS9 error codes
Goodman and Amana GMSS9, GCSS9, AMSS9, ACSS9 flash codes. 8 codes.
Check this is your model before you read on
The model number on your data plate should start with GMSS9, GCSS9, AMSS9, ACSS9. Flashes 1 through 8. This is a Honeywell platform control with its own wording and its own assignments. It is not the GMV table, even though the numbers look similar.
A Honeywell-platform control with its own wording and its own code assignments. It is not the GMV table.
The same table applies to amana, Daikin models on the same control platform.
How to read this code
Single red LED, counted blinks, with a long pause between groups.
2000s. 8 codes on this control platform.
8 fault codes
Every one of these means something is wrong. Ordered by how urgent they are.
1 flashGoodmanFurnace lockout after 3 ignition retries2 flashesGoodmanPressure switch circuit closed3 flashesGoodmanPressure switch circuit not closed4 flashesGoodmanPrimary or auxiliary limit circuit open5 flashesGoodmanFlame sensed with no call for heat6 flashesGoodmanRollout limit open or control module fuse blown7 flashesGoodmanFlame sense signal low8 flashesGoodmanProblem with igniter circuit