20 Most Recent Aprilaire 550 Humidifier Questions & Answers


This sounds like, the 550 transformer is not connected to the blower motor power connection (in parallel)

Aprilaire 550... | Answered on Feb 09, 2017


Hello, this can be either a clogged drain line or the tubing supplying the water into the humidifier is cracked. The size of the house has nothing tomdo with the water leaking into the Furnace.

Aprilaire 550... | Answered on Mar 21, 2015


1/4" flexible copper pipe. Tap into your cold water line using the included saddle valve (pierces the pipe), attach the 1/4" flexible copper pipe to the saddle valve on the cold water pipe and the solenoid valve on humidifier unit using the included compression fittings. Tada!

Aprilaire 550... | Answered on Feb 18, 2015


Try closing damper slightly between humidifier and furnace????

Aprilaire 550... | Answered on May 30, 2014


If your water is suddenly evaporating into limescale, your local water company may have switched to a different water source, or your water softener device is out of salt. The limescale can be easily cleaned with vinegar and a sponge, but this will keep occuring unless you use water that doesn't contain disolved calcium. Try getting an RO water filter and use that water.

Aprilaire 550... | Answered on Mar 15, 2014


You should have a dial setting usually on the return duct box near where your filter goes. It is probably about the size of your thermostat. Set at around 40%

Aprilaire 550... | Answered on Jan 17, 2014


If the water stops when the heater is not running then the humidifier is working fine. I know it seems like alot of water but that's how it's designed.

Aprilaire 550... | Answered on Jan 13, 2014


It's probably the saddle valve. The self-piercing needle rusts and clogs the water line. Replace the saddle valve with a non self piercing one. Also, check the voltage to the solenoid valve on the humidifier. You should be getting 24 ac volts. If not, replace the transformer. If voltage is present and still no water, then replace the solenoid valve (very expensive).

Aprilaire 550... | Answered on Jan 30, 2013


your drain pipe is clogged up, going to drain- Duh

Aprilaire 550... | Answered on Jan 24, 2013


I had the same problem with my new furnace. it was a crack in the blower fan housing . that was 12yrs ago. it is starting to act similar now. it just will stay running like it is blowing out gas and then restarts occasionally.

Aprilaire 550... | Answered on Jan 14, 2013


Typically when the water continues to run after the blower cycle stops, the solenoid valve is stuck open and will need to be replaced.

Aprilaire 550... | Answered on Nov 26, 2012

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lime scale build up slime in bottom

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