FieldBench
Trane codes

Trane

Inverter OC / OH

Lockout

Drive overcurrent / overheat (drive LED)

Outdoor inverter protection. Read the drive LED / ComfortLink text. Not a contactor or dual-cap failure.

Walk Inverter OC / OH in Diagnose

2 plates — walk the one on the cabinet

First check

1 Let it cool, then read the drive LED

On Trane XV18 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. Compressor to ground and winding integrity. Heat sink / drive cooling path.

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

The rest of the walkthrough is Diagnose.

On the plates

  • Compressor to ground and winding integrity. Heat sink / drive cooling path.
  • Supply voltage at the outdoor (208–230 class). Brownout plus a long line-set is a real trip.
  • Weigh-in vs nameplate before you condemn a drive on a charge-related overcurrent.

Plates that use Inverter OC / OH