Goodman

Eb / Ec

Lockout

Gas valve circuit

Internal (Eb) or external (Ec) gas-valve electrical fault.

3 plates — walk the one on the cabinet

First check

1 Coil ohms and 24 VAC during trial only

On Goodman GR9S80 measure each solenoid. 24 VAC should appear only during trial / the commanded stage. Valve coil ohms, 24 VAC at the harness during trial.

Expect: Coil ohms per the valve sticker. 24 VAC only when the IFC commands that stage.

The rest of the walkthrough is Diagnose.

On the plates

Valve coil ohms, 24 VAC at the harness during trial.
Do not apply 24 V to a leaking valve as a ‘test’ and walk away.

Plates that use Eb / Ec

GR9S80
Single-stage · 9-speed ECM · 80% Cat I
Diagnose GR9S80 — Sign in
GR9T80
Two-stage · 9-speed ECM · 80% Cat I
Diagnose GR9T80 — Sign in
GR9T96
Two-stage · 9-speed ECM · 96% AFUE
Diagnose GR9T96 — Sign in

Same number, other makers

Eb / Ec on Goodman is not the same code on these plates.

Amana Eb / EcGas valve circuit