Question about Humidifiers

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No water going to evaporater plate

SUSPECT SOLONOID FAULTY

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Try removing the cover, and manually cycling on the controler switch? Does the solenoid click on, next to the humidifier (the unit with the water line running through it, with wires coming out of it)? If it does click on, is water running down the water pad? It doesn't necessarily drain water out of the unit when it's working correctly. All of the water SHOULD be getting evaporated into the air return duct.

If it's clicking on, but no water is running out, you should check the water supply saddle valve and make sure it wasn't turned off during servicing.

If it's not clicking on, you should test that you are getting voltage (12v-18v DC) to the solenoid. If you're not, check all wiring connections and make sure they're tight. If you still don't get power, you have either a problem with your control unit/humidistat, your DC power supply, or the control board on your furnace. You may need to call a HVAC technician at that point, depending on your comfort level/skill level in that regard.

Posted on Jan 06, 2013

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1 Answer

I have an Aprilair humidifier that started making a loud humming/buzzing noise. The water runs OK but the soloniod is burning hot to the touch. Is this normal?


Yeah they do need to be replaced from time to time. Make sure you get a water test kit and check your water hardness. You may need a whole home water filter if it is outside of normal ranges. A pretty easy DIY project and relatively inexpensive at the big box stores

Nov 29, 2013 | Aprilaire 700 Humidifier

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Honeywell humidifier mod. HE-255, NOT WORKING


Try removing the cover, and manually cycling on the controler switch? Does the solenoid click on, next to the humidifier (the unit with the water line running through it, with wires coming out of it)? If it does click on, is water running down the water pad? It doesn't necessarily drain water when it's working correctly. All of the water SHOULD be getting evaporated into the air return duct.

If it's clicking on, but no water is running out, you should check the water supply saddle valve and make sure it wasn't turned off during servicing.

If it's not clicking on, you should test that you are getting voltage (12v-18v DC) to the solenoid. If you're not, check all wiring connections and make sure they're tight. If you still don't get power, you have either a problem with your control unit/humidistat, your DC power supply, or the control board on your furnace. You may need to call a HVAC technician at that point, depending on your comfort level/skill level in that regard.

Jan 06, 2013 | Humidifiers

1 Answer

Water runs without furnace running


If this is a new problem, on an existing humidifier, then it is most likely a bad solonoid valve. This is the valve that the water line is connected to, and it controls the flow of water to your humidifier.

If this is a problem on a newly installed humidifier, it is possible to have wired the humidifier directly to the transformer power, and therefore holding the valve open all the time.

Hope this helps

Nov 03, 2010 | Aprilaire 700 Humidifier

1 Answer

Just moved into home with a250 mumidifier. water not getting to unit. It's turned on.


Is the water supply on? If you have a voltmeter, check for voltage across the solenoid valve leads when the furnace is heating. If you have voltage, but don't hear a click when the furnace turns on, suspect faulty solenoid.

Dec 09, 2009 | AutoFlo 250 Humidifier

1 Answer

Water will not shut off even when unit unplugged. With power on the solonoid sounds like it is going on and off but not...


need a new solinoid and valve probably has mineral build up in valve can't close. Turn off at line tap on your water pipe. clean or replace

Nov 28, 2009 | Air King Humidifiers

1 Answer

No water flow in humidifier


clearly your water pump is broken. or you solonoid

Nov 11, 2009 | Aprilaire 600 Humidifier

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I have random pipe shocking heavyly.


It sounds like your solonoid valve on the humidifier was slamming shut cause the water hammer, no call for heat, no humidifer.

Apr 20, 2009 | Honeywell HE365 Humidifier

1 Answer

Aprilair 760 Humidfier will not stop water flow to EV panel


If the water continues runs nonstop even when the heater is turned off, you might have either a bad solenoid valve or a bad humidistat. Simply disconnect one of the two low voltage wires going into the unit. If the water turns off then your problem is most likely your humidistat or the low voltage wiring. If the water continues to run even when the low voltage is disconnected you have a defective solenoid valve.
Good luck.......

Apr 09, 2009 | Aprilaire 700 Humidifier

1 Answer

No water


could also be a clogged filter or orifice. take input line off solonoid and check.clean filter, blow thru orifice. clean with small needle or buy new one.

Dec 20, 2008 | Aprilaire 700 Humidifier

1 Answer

SOLENOID DOES NOT SEEM TO BE WORKING.


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.

Jan 06, 2008 | Aprilaire 550 Humidifier

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