FieldBench
Trane codes

Trane

HPS

Lockout

High pressure

Discharge / liquid opened the high-pressure switch.

Walk HPS in Diagnose

4 plates — walk the one on the cabinet

First check

1 Let it cool, then read the drive LED

On Trane XR16 overcurrent / overheat is often a dirty coil, a failed OD fan, or a locked compressor — not a dead inverter. Clear airflow, confirm the OD fan, and read the drive LED before you order a control. HPS continuity, reset if manual, wiring in series with the coil.

Expect: OD fan running. Coil clean. Drive LED decoded from THIS outdoor’s card.

The rest of the walkthrough is Diagnose.

On the plates

  • HPS continuity, reset if manual, wiring in series with the coil.
  • Outdoor airflow: dirty coil, bent fins, fan not running (see ODF / cap).
  • Overcharge or non-condensables — confirm indoor metering before you recover (SH vs SC).
  • Do not treat this as a 25VNA drive trip.
  • OD coil packed. Fan running and correct rotation on 3-phase.
  • Overcharge or non-condensables. Recirc over a low roof screen.
  • Indoor airflow so bad the refrigerant has nowhere to go — still an HPS trip.

Plates that use HPS

Same number, other makers

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