Goodman

E5

Protect

Open fuse

IFC automotive fuse is open.

9 plates — walk the one on the cabinet

First check

1 Find the 24 V short before you replace the fuse

On Goodman GMEC96 an open IFC fuse is a short on W, Y, G, HUM, EAC, or a data pair landed on 24 V. Unplug the thermostat / data harness first. 24 V short on W, Y, G, humidifier, EAC.

Expect: Fuse out. 24 V transformer still good. Harness isolated.

The rest of the walkthrough is Diagnose.

On the plates

24 V short on W, Y, G, humidifier, or EAC.
Unplug tstat harness and replace fuse. If it blows again the short is on the board or gas valve harness.
24 V short on W, Y, G, humidifier, EAC, or leftover ComfortBridge data landed on 24V.
Unplug tstat / data harness and replace fuse. If it blows again the short is on the board or valve harness.
24 V short on W, Y, G, humidifier, EAC.
Unplug tstat harness and replace fuse.
24 V short on leftover W/Y/G, humidifier, EAC, or data pair landed on 24V.
Unplug harnesses and replace fuse. Repeat blow = board or valve harness.

Plates that use E5

Same number, other makers

E5 on Goodman is not the same code on these plates.