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A104

A104 - Water Leak Detected

Rheem · Water Heaters

What does A104 mean?

Water has been detected by the leak sensor in the bottom pan of the unit. The heater may be disabled.

Common Causes

  • Water leak from the unit
  • Condensation
  • Faulty leak sensor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Locate the source of any water and correct the issue.

  2. 2

    Ensure the area around the unit is dry.

  3. 3

    Contact a qualified service provider.

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

Related Faults

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