FieldBench
Lennox codes

Lennox

E117

Protect

Poor ground

Ground is present but dirty. Warning only — clears ~30 s after it recovers.

Walk E117 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. Same ground path as E112, just not open. Flame µA and HSI both suffer.

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

  • Same ground path as E112, just not open. Flame µA and HSI both suffer.
  • Do not ignore a repeating E117 on an E240 / E270 call.

Plates that use E117