FieldBench
York codes

York

1 red

Hazard

Flame sensed, no call for heat

Flame with valve de-energized.

Walk 1 red in Diagnose

5 plates — walk the one on the cabinet

First check

1 Shut the gas cock first

On York TM8T the rod sees flame with the valve de-energized. Shut the cock. If flame stays, the valve is leaking — replace it. Do not jump or energize it as a test. Shut the cock. Leaking valve.

Expect: Flame dies when the cock is shut.

If fail: Leaking valve. Replace. Do not leave the unit.

The rest of the walkthrough is Diagnose.

On the plates

  • Shut the gas cock. If flame stays, leaking valve — replace, do not jump.
  • Rod shorted to ground or IFC flame circuit.
  • Treat as hazard until the valve is proven closed.
  • Shut the cock. Leaking valve is a hazard.
  • Shut the cock. Leaking valve.

Plates that use 1 red