Goodman
E8
LockoutHigh-fire PS stuck closed
High-stage pressure switch is made with the inducer not on high.
Walk E8 in Diagnose
7 plates — walk the one on the cabinet
First check
1 Prove the switch is made with inducer not on high
On Goodman GMEC96 this code means the high-fire switch is closed when it should be open. Do not treat it as the low-fire stuck-closed code. Write the live display, then unplug the high-fire switch only.
Expect: Code should change when the high-fire harness is open.
If fail: IFC input shorted or you unplugged the wrong switch.
The rest of the walkthrough is Diagnose.
On the plates
- This is the second switch — do not confuse with E1.
- Welded HPS or water-filled hose.
- IFC calling high when it should be low — W2 shorted to W1.
- Second switch — do not treat as E1.
- W2 shorted to W1 on 24V fallback.
- Second switch — do not confuse with E1.
- Welded HPS, water in the hose, W2 shorted to W1.
- Second switch. Water in the hose or a welded high-rate PS.
Plates that use E8
Same number, other makers
E8 on Goodman is not the same code on these plates.