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53

53 — Out of phase detection fault

Rheem · Air Handlers

What does 53 mean?

This fault means the system has detected an out-of-phase condition for the fan motor. This can be due to phase loss or defective control board components.

Common Causes

  • Fan motor phase loss
  • Defective control board components

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the Main PCB.

  2. 2

    Replace the fan motor.

Browse all codes in this manual (51)
Verified technical data. Last updated: April 2026

Related Faults

1Fault code 1 — Inverter DC voltage overload fault10Fault code 10 — PFC fault (level)11Fault code 11 — PFC power detection of failure
Source: Rheem Air Handlers
Open Manual (Page 187)Search more codes in this manual