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LED display shows “oF”

Water Saving Control Initialization — Setting activation display

Rheem · Tankless Water Heaters

What does LED display shows “oF” mean?

The LED display on the built-in control shows 'oF'. This temporary display indicates the system is processing the activation of the water saving control.

Common Causes

  • Initial setup or reset of the water saving control.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the third switch on 'DIP 1' is in the ON position.

  2. 2

    Press the 'Max' or 'Min' button on the control board.

  3. 3

    Wait for the display to change from 'oF' to indicate the active setting ('ON' or 'OF').

  4. 4

    Turn on gas and water supply.

Browse all codes in this manual (24)
Verified technical data. Last updated: April 2026

Related Faults

88Error 88 — Maintenance required before clearing codeAlarm/Error IndicatorSystem Alert — An issue has been detectedDANGER: Shock HazardDANGER: Shock Hazard — Electrical power is present
Source: Rheem Tankless Water Heaters
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