FieldBench
Lennox codes

Lennox

E207 / E290

Lockout

HSI / ignitor circuit

Ignitor open or trigger fault.

Walk E207 / E290 in Diagnose

3 plates — walk the one on the cabinet

First check

1 Ohms at the igniter, then at the IFC

On Lennox SL280 measure cold ohms at the igniter plug, then at the IFC connector. An open at the plug is the element or local harness. Open only at the IFC is the harness rub-through on the collector. Ohms and 120 VAC during trial.

Expect: Nitride cold ohms per THIS door sticker — do not use an 80% Norton chart.

The rest of the walkthrough is Diagnose.

On the plates

  • Ohms and 120 VAC during trial. Confirm on the SLP99 door card.
  • Ohms and 120 VAC during trial.

Plates that use E207 / E290