CodeRegistry
Brands
  1. Home
  2. Rheem
  3. Air Conditioning
  4. T901
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

T901

T901 - Controller fault: Call Tech Service

Rheem · Air Conditioning

What does T901 mean?

A fault has been detected within the controller. This requires professional diagnosis and repair.

Common Causes

  • Controller malfunction
  • Internal electronic fault

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the unit is receiving power.

  2. 2

    Attempt a power cycle by turning the unit off and then on.

  3. 3

    Contact technical service for assistance.

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