Question about Aprilaire 550 Humidifier

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I hear to click of the relay, but no water is feeding into the unit

The power is on the furance, I set the humidifer to the approariate setting and I hear the click of the relay, but no water is feeding into the unit?

what can I do?

Godfather814

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  • godfather814 Nov 24, 2007

    right on the money. it was the solenoid valve. replaced it myself. thanks for your help.

  • Anonymous Dec 19, 2008

    I took off the feed line for water and it had water pressure, cleaned the filter in the relay but no water to the filter.

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Sounds to me like the solenoid valve is your problem and it is likely stuck due to sediment. I beleive Aprilaire has superceeded all of their old valves to the part number 4040 (used on all models of aprilaire humidifiers) - anyone who services these units regularly likely has one in stock usually $60 - 100.

Posted on Nov 21, 2007

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