FieldBench
Trane codes

Trane

Smoke

Hazard

Smoke / firestat

Supply or return smoke detector, or a firestat, has the unit locked out.

Walk Smoke in Diagnose

2 plates — walk the one on the cabinet

First check

1 Which detector tripped

On Trane YHC supply and return smoke, or a firestat, shut the unit down. Find which device is open before you reset. Welding and a dirty return nuisance-trip these. Reset only after you know why it tripped. Welding and dirty returns nuisance-trip these.

Expect: The tripped detector identified. Space not actually in alarm.

The rest of the walkthrough is Diagnose.

On the plates

  • Reset only after you know why it tripped. Welding and dirty returns nuisance-trip these.
  • The unit board sees this as a shutdown, not a refrigerant fault.

Plates that use Smoke

Same number, other makers

Smoke on Trane is not the same code on these plates.