Rheem Error Code 21

Fault Code 21: Malfunction of Air Intake Filter Switch

 

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    Rheem Fault Code 21

    Fault: Malfunction of Air Intake Filter Switch

    Applies To: Rheem Tankless

    Your Rheem water heater has an electronic diagnostic system built directly into it. When your water heater finds a problem, it displays an error code in the LED display on the remote control or the front panel.

    SKU: 415-1-1-2-1-1-1-1-1-1-1-1-1-1 Category: