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A906

A906 - Power board temp. protection sensor failure

Rheem · Air Conditioning

What does A906 mean?

The temperature protection sensor on the power board has failed, or the controller is overheating. This requires immediate attention from technical service.

Common Causes

  • Power board temperature sensor failure
  • Controller overheating

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the unit is installed in a location with adequate ventilation.

  2. 2

    Check for any obstructions around the unit that might impede airflow.

  3. 3

    Contact technical service immediately for diagnosis and repair.

Browse all codes in this manual (48)
Verified technical data. Last updated: April 2026

Related Faults

1 beep1 beep - WiFi Soft Reset initiated3 beeps3 beeps - WiFi Hard Reset initiated3 red flashes3 red flashes — Communication error
Source: Rheem Air Conditioning
Open Manual (Page 34)Search more codes in this manual