FieldBench
Lennox codes

Lennox

E112

Lockout

Ground not detected

IFC does not see earth ground. Unit shuts down.

Walk E112 in Diagnose

2 plates — walk the one on the cabinet

First check

1 Hot and neutral at the IFC, not the disconnect

On Lennox EL195NE polarity/ground is measured at the board. A correctly landed disconnect with a swapped whip at the IFC still throws this. Green to cabinet and IFC. Painted screw / missing star washer.

Expect: L1 hot, N neutral, ~120 VAC L1 to N, ~0 VAC N to ground.

The rest of the walkthrough is Diagnose.

On the plates

  • Green to cabinet and IFC. Painted screw / missing star washer.
  • Resumes ~5 s after a real ground is provided.

Plates that use E112