Question about Aprilaire 550 Humidifier

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Water flow to my humidifier wont stop. and the pump is constanly running.

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Sounds like the float valve inside the water holding tank is stuck in the open (down) position. Unplug the unit and take the cover off the tank portion of the humidifier. Look inside and you will see the float valve, if it's in the down position, manually lift is up. If it stays in the up position the incoming water should stop, The next thing is to determine what caused it to get stuck? Is there some sort of debris in the tank? Is the float lever rod bent or out of place? Does the float on the end have a hole in it and is full of water? These are the things you need to start with in troubleshooting the unit.

Hope this helps to get your started in solving the problem.

Posted on Mar 11, 2011

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