Rheem · Tankless Water Heaters
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.
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Ensure the third switch on 'DIP 1' is in the ON position.
Press the 'Max' or 'Min' button on the control board.
Wait for the display to change from 'oF' to indicate the active setting ('ON' or 'OF').
Turn on gas and water supply.