Question about Aprilaire 550 Humidifier

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Power is off to aprilaire 550

Looking for restart button will turn on

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  • Chris Parrish May 11, 2010

    need more info not sure what the problem is

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The Aprilair Hum. donot have a restart button. All there is there is just a 24VAC Solenoid that opens and lets the water flow throu a tube. Check your humidistat, check your wire going to the furnace control board and also your current sensing relay if you have one.

Posted on Feb 09, 2009

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1 Answer

Aprilaire 550 not turning on


Hello, apply power directly from transformer to solenoid valve, it it does not turn on the solenoid valve must be replaced. If there is no voltage to the solenoid then follow the wires back and see where there is no voltage.

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