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52

52 — Abnormal speed control

Rheem · Air Handlers

What does 52 mean?

This code indicates an issue with the fan motor's speed control. It might be caused by defective control board components, fan motor shaft clamping, or fan motor insulation failure.

Common Causes

  • Defective control board components
  • Fan motor shaft clamping
  • Fan motor insulation failure

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