FieldBench
York codes

York

10 red

Hazard

Flame sensed, no call (some boards)

Same as 1-red on later revisions.

Walk 10 red in Diagnose

5 plates — walk the one on the cabinet

First check

1 Measure µA while it is running

Do not clean first and guess. Series-µA the rod on York TM8T during a call. Falling µA is oxide, ground, or a dying flame. A hard drop is often the pressure switch or limit opening, not the rod. Door card. Valve leak.

Expect: Flame sense: Normal ~3.7 µA DC. Warning < 1.5 µA. Lockout < 0.1 µA.

The rest of the walkthrough is Diagnose.

On the plates

  • Read the door card on THIS IFC. 1-red vs 10-red is a revision split, not two different physics.
  • Gas valve leak / slow close. Shut the cock.
  • Door card on THIS IFC. Valve leak.
  • Door card. Valve leak.

Plates that use 10 red