FieldBench
York codes

York

12 red

Lockout

Open igniter circuit

HSI path open.

Walk 12 red in Diagnose

5 plates — walk the one on the cabinet

First check

1 Ohms at the igniter, then at the IFC

On York TM8T 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 at the igniter plug, then at the IFC. Cracked nitride is common.
  • Harness rub-through on the collector.
  • Loose/disconnected igniter plug after a heat-exchanger job.
  • Ohms at the plug and at the IFC. Cracked nitride.
  • Ohms and 120 VAC during trial.

Plates that use 12 red