FieldBench
Trane codes

Trane

Cool fail

Lockout

Reliatel cool fail

Mechanical cool did not prove.

Walk Cool fail in Diagnose

2 plates — walk the one on the cabinet

First check

1 Write the live code and watch one cycle

On Trane YHC read Reliatel — Precedent YHC before you pull power. Write Cool fail exactly. Watch one full sequence and note which step dies. Economizer first, then contactor / HPS.

Expect: Call: Occupied / G starts the indoor fan. Y1 is cool. W is gas heat. They are different boards in the same box.

The rest of the walkthrough is Diagnose.

On the plates

  • Y1 at Reliatel. Economizer may be satisfying — check damper first.
  • Contactor, HPS/LPS, phase monitor, compressor internal OL.
  • Economizer first, then contactor / HPS.

Plates that use Cool fail