Question about Aprilaire 550 Humidifier

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SOLENOID DOES NOT SEEM TO BE WORKING.

MY APRIL AIRE #550 SOLONOID VALVE DOES NOT SEEM TO BE OPENING. I SEEM TO HAVE POWER TO THE UNIT. THE UNIT IS ONLY 3 YRS. OLD. HOW CAN I TROUBLESHOOT THE SYSTEM ? THANK YOU, TOM NEWTON.

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If your humidifier is wired to run only wen your fan is on. if your water supply is could you will not get any humidity unless the heat in on. you need to connect the humidifier to hot water then you can keep the fan on the on positions by your thermostat and set your hemostat to 35% hum.

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.

Nov 18, 2011 | Aprilaire 550 Humidifier

2 Answers

I have an Aprilaire 550 that is not working... don't know if the unit is getting water or not or if somethig else is wrong. What steps can I take to check this out. I tried turning the knob to test, then...


Do you hear the solenoid click. Furnace must be on and humidistat must be up. Do you have the ability to check for 24 volts (2 wires at solenoid). Loosen copper nut at solenoid to see if water is present. (Be careful about water spraying). Loosen nut on humidifier side of solenoid. Could be small blockage in copper line at solenoid.(There is a very small orifice there that could get clogged)
Could be Humidistat also. really need voltage meter to check wiring.

Jan 25, 2011 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 550 There is no water going through the solenoid to the feed tube. I recently purched a new solenoid.


The first thing to check is if you are getting 24 volts at the transformer, if you are not then turn off power the transformer and check continuity. u should have continuity if not replace the transformer. If you are getting 24 volts at the transformer then apply 24 volts directly from transfomer to solenoid valve you should hear the solenoid cleck open and let the water in, if not then the solenoid is bad and must be replaced. If the solenoid does work by applying voltage directly to it then check the
wiring and make sure it;s all tight. Also check the humidistat and current sensing relay/sail switch to make sure it's functioning properly.

Jan 13, 2011 | Aprilaire 550 Humidifier

1 Answer

My aprilaire humidifier model 500 series does not seem to kick in. I try moving the manual control when the furnace kicks in but even turning the control to the max nothing happens


Check to see if you are getting 24 volts at the transformer, if you are then bring the power directly from the transformer to the solenoid valve and see if the solenoid valve clicks open by moving the knob on the humidistat. If nothing happens then most likely the solenoid valve is bad and needs to be replaced. If the solenoid valve does work after bringing power directly to it then either tne problem is the humidistat it self or the sail switch/current sensing relay.

Jan 09, 2011 | Aprilaire 550 Humidifier

1 Answer

Hello! Humidifier quit working. Turned dial to test and nothing. Usually I hear the humidifier working if I increase the dial to a higher level but nothing. Could it be the solonoid is gone? Thanks!


if you hear a "click" at the unit when you increase the demand for humidity it could be a clogged solenoid valve. If you heart nothing this could indicate a power problem. turn the humidistat to the highest setting and verify the proper voltage is available at the solenoid, if so, the solenoid needs to be replace. hope this helps.

Dan

Nov 25, 2010 | Aprilaire 550 Humidifier

1 Answer

My 550 is bone dry. I've cleaned the small in line screen blew out the line. How do I know if its the selinoid or humidistat?


Turn off the water to the humidifier

Disconnect the water line to the inlet water valve (the solenoid), catch any excess water or drips in a small container

Turn the water back on slowly and see if water flows through the open line (the one you just disconnected - catch the water in a small bucket)

If you have water to the valve, it's probably the solenoid valve - you can test this by reconnecting the water line and turning the humidistat all the way up. You should hear a click as the solenoid tries to open. If it clicks and no water comes out it's the valve. If there is no water to the valve, you'll need to determine the reason(s). Although not every water valve has one, check for a plugged inlet screen at the entry to the water valve (solenoid)
Sometimes the small line tap valves commonly used with humidifiers can plug up or malfunction. If you try to repair or replace the tap valve, make sure the water is turned off.
If no click, it could be the humidistat or there is no power to the unit.
If the humidistat is bad, you won't hear any click and no power will be sent to the solenoid valve. In that case, the humidistat may be defective.

Depending on your comfort level and knowledge, you can try applying power directly to the valve by bypassing the humidistat, but only try this if you are comfortable working with electricity. The voltage should be around 24 volts (in the USA) , which is low, but requires some knowledge.

Dec 29, 2009 | Aprilaire 550 Humidifier

1 Answer

My Aprilaire 550 is bone dry. How do I know if its the Humidistat or Celinoide?


Turn off the water to the humidifier

Disconnect the water line to the inlet water valve (the solenoid), catch any excess water or drips in a small container

Turn the water back on slowly and see if water flows through the open line (the one you just disconnected - catch the water in a small bucket)

If you have water to the valve, it's probably the solenoid valve - you can test this by reconnecting the water line and turning the humidistat all the way up. You should hear a click as the solenoid tries to open. If it clicks and no water comes out it's the valve. If there is no water to the valve, you'll need to detrmine the reason(s). Sometimes the small line tap valves commonly used with humidifiers can plug up or malfunction. If you try to repair or replace the tap valve, make sure the water is turned off.

If no click, it could be the humidistat or there is no power to the unit.
If the humidistat is bad, you won't hear any click and no power will be sent to the solenoid valve. In that case, the humidistat may be defective.

Depending on your comfort level and knowledge, you can try applying power directly to the valve by bypassing the humidistat, but only try this if you are comfortable working with electricity. The voltage should be around 24 volts (in the USA) , which is low, but requires some knowledge.

Dec 29, 2009 | Aprilaire Humidifiers

1 Answer

Humidistat know set to on. Water pressure to


Have you checked to see if the solenoid opens and closes? You should hear a distinct click when the solenoid valve energizes. Depending on the quality of the water in your area, it's possible that the valve is scaled up....again and plugged. If the valve operates, you can usually clean it with a product called CLR which dissolves scale (lime buildup). This will require removal and disassembly of the valve. Please be sure to turn off the power before working on the unit.
Some solenoid valves are equipped with an inlet screen that could also be plugged with scale or debris.

Dec 08, 2009 | Aprilaire 550 Humidifier

1 Answer

Continuous water flowing


thanks for your questions,
what you will want do first, disconnect one lead off of your Humidistat, or at the Solenoid, to see if that stops the water, if it does, you will need a new Humidistat, if not, then you have a bad Solenoid, that will need replaced, you should be able to purchase one or both of these either online, or through an appliance store, or your local Heating and A/C shop, hope that helped ya, let us know how we did, thanks again,
mr.grzz

Dec 18, 2008 | Aprilaire 550 Humidifier

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