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A102

A102 - Time Clock needs to be programmed

Rheem · Water Heaters

What does A102 mean?

The internal clock of the water heater needs to have the time and date set.

Common Causes

  • Time and date not set

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Go to Settings on the control panel.

  2. 2

    Select the time/date menu.

  3. 3

    Set the current time and date.

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 45)Search more codes in this manual