FieldBench
York codes

York

Steady red

Lockout

Control failure

Internal IFC fault.

Walk Steady red in Diagnose

5 plates — walk the one on the cabinet

First check

1 Write the live code and watch one cycle

On York TM8T read JCI / Coleman-York IFC · green / amber / red LED before you pull power. Write Steady red exactly. Watch one full sequence and note which step dies. Power and fuse, then the board.

Expect: W1: Inducer → draft/pressure switch on the metal vent / inducer housing → HSI → low fire. No secondary drain to prime.

The rest of the walkthrough is Diagnose.

On the plates

  • Confirm it is truly steady, not a fast count you missed.
  • 120 VAC and 24 VAC present, fuse good, then replace the control. The IFC is not field-repairable.
  • Power and fuse first, then replace the control.
  • Power and fuse, then the board.

Plates that use Steady red