FieldBench
Lennox codes

Lennox

E205

Lockout

Gas valve control relay shorted

IFC thinks its valve relay contacts are shorted.

Walk E205 in Diagnose

2 plates — walk the one on the cabinet

First check

1 Coil ohms and 24 VAC during trial only

On Lennox EL195NE measure each solenoid. 24 VAC should appear only during trial / the commanded stage. Unplug the valve. If E205 stays, the IFC relay is the fault.

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

  • Unplug the valve. If E205 stays, the IFC relay is the fault.
  • If it clears, ohm the valve coil and harness for a short to chassis.

Plates that use E205