Question about Aprilaire 550 Humidifier

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My 6 year old aprilaire 550 humidifier doesn't drip into sink . last year the service man said that he just needed a thin needle like device to clear a passage somewhere in the hookup.

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  • hedyart Nov 15, 2009

    Is there an online diagram
    which would allow me to find these two places?

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  • 91 Answers

Possibly the water connection valve has plugged or the electric valve on the water line to the humidifier may be plugged.

Posted on Nov 13, 2009

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1 Answer

Before we replaced our furnace, I had to replace the transformer almost every year. When the new furnace was installed last year, the transformer disappeared. Now with winter coming on, the 550 hasn't


Hello, seems like there is no way to turn on the humidifier. There would either need to be a new transformer installed, a current sensing relay, or a sail switch to activate the humidifier when the blower motor kicks on.

Nov 22, 2011 | Aprilaire 550 Humidifier

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.

Nov 18, 2011 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 550 making loud noise - sound like not enough water going through pump?


Hello, check to see that the inlet strainer into the solenoid is clean and no sediment has built up in it, also make sure the outlet of the saddle valve is clear and there is no sediment there.

Feb 14, 2011 | Aprilaire 550 Humidifier

1 Answer

How much water should be draining from Aprilaire 550?


thats too much.. and a waste of water... you should install a good ball valve water shutoff inline and let it trickle.. ideally, it should be net zero water wastage but there's always a bit.. my water take-off drain runs about once every 5hrs and its about a litre (its siphoning water out of the combustion chamber as well as the waste water from the humidifier.. (you can get those ball valves at homedepot for about 6bucks -- they're usually compression fittings as well)

Jan 11, 2010 | Aprilaire 550 Humidifier

1 Answer

We have an old Aprilaire humidifier (Manual adjust)and having problems trying to figure out how to shut it off-for the summer.


close the by pass air flow valve. shut off the water supply and finally flow the thermostat wire to the transformer or the controller and shut off or disconnect. Unit should be serviced before winter. Cell may need to be replaced

Aug 10, 2009 | Aprilaire 550 Humidifier

1 Answer

I don't know how open 550 unit to check or change water level.


sould be a small handle on the oppisite side frm the duct outlet. it just pops off

Apr 22, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 550 humidifier


You can call 1-800-955-7075 give them the make and model #.The part # should be 4217,10x113/8 frame for $14.56 plus shipping

Nov 20, 2007 | Aprilaire 550 Humidifier

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