Alert Code 345 — Relay O Failure

What does 345 mean?

This critical alert means the O relay on a system component has failed. Either the pilot relay contacts did not close or the relay coil did not energize.

• O relay failure
• Stage 1 failure

Click steps to track your progress.

1. 1

   This alert automatically clears after the fault is recovered following a reset.

2. 2

   If the error applies to specific outdoor unit models (XC20, XC25, XP20, XP25) and persists, the outdoor control may need replacement. Contact a qualified technician.