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T105

T105 - Water Leak Sensor Not Installed

Rheem · Water Heaters

What does T105 mean?

The system is indicating that the water leak sensor may not be installed or is not properly connected. Check the connection on the ignition control board.

Common Causes

  • Water leak sensor not installed
  • Loose water leak sensor connection

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the water leak sensor is installed correctly.

  2. 2

    Check the wiring connection for the water leak sensor.

  3. 3

    Refer to the use and care manual for troubleshooting.

  4. 4

    Contact technical support if the issue persists.

Browse all codes in this manual (70)
Verified technical data. Last updated: April 2026

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1111 - Gas shut-off valve is not fully open1212 - Gas service interrupted or LP gas low13Hot and cold water lines reversed
Source: Rheem Water Heaters
Open Manual (Page 46)Search more codes in this manual