FieldBench
Lennox codes

Lennox

E111

Lockout

Low line voltage

Line voltage below nameplate. Control waits; resumes ~5 s after voltage recovers.

Walk E111 in Diagnose

2 plates — walk the one on the cabinet

First check

1 Measure at the IFC under load

On Lennox EL195NE line-voltage codes are incoming power. Measure L1/L2 (or L1/N) at the board while it is trying to run, not just at the disconnect. L1 to N at the IFC, not just the disconnect. Brownout, loose lug, undersized circuit.

Expect: Voltage in the rating-plate window under load.

The rest of the walkthrough is Diagnose.

On the plates

  • L1 to N at the IFC, not just the disconnect. Brownout, loose lug, undersized circuit.
  • Some older EL296UHE cards print E110 as low line and E111 as polarity reversed — confirm THAT door card.

Plates that use E111