Question about AutoFlo 400BP Humidifier

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No water going to furnace humidifier

How do I test the solinoid on my furnace humidifier? the line after the solinoid is not plugged. When the furnace is running the solinoid does not turn the water on.

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The furnace should be equipped with a #50 relay to turn the Humidifier on and off when only when the furnace blower is on. You should have a test mode on your humidistat. Do you have water coming up to the solenoid valve? Make sure that the saddle valve is turned on to supply the water to the humidifier. Is your humidistat set high enough to turn the humidifier on? Is it plugged in?
Good luch
HVAC Teacher

Posted on Mar 08, 2009

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No humidity in house can not see water coming out of solinoid or what ever that device is that the water line goes into and comes out of between the water line and the line going to filter


Hello. the first thing you need to determine is if the solenoid is getting 24 volts when the furnace turns on, you should be getting 24 volts at the solenoid valve. If not you need to start at the transformer and see if you are getting 24 volts there, if not then most likely the transformer is bad and must be replaced, if you are getting 24 volts at the transformer then check the wiring and make sure it;s tight. also check the humidistat and sail switch/ current sensing relay to make sure they are working properly. If you are getting 24 volts at the solenoid valve and is not allowing water thru than it must be replaced.

Feb 04, 2011 | Aprilaire 600 Humidifier

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No water flowing to water panel but have water to the solenoid. I have a Aprilaire model 550. wondering if the solenoid is bad and how do I check it.


To test solenoid, apply 24V directly to the terminals as see if water flows through it. Alternativly, turn everything on, ensure that there is 24 volts accross the solenoid wires, if you show 24Volts and no water, solenoid is bad. To test you will need to set your meter to AC Volts.
If you have a separate black transformer supplying the 24 volts, hook that directly to the solenoid. You may also be getting the 24Volts from your furnace circuit board, if that is the case you will see two terminals usually marked HUMIDIFIER on the furnace circuit board (you will need to open your furnace usually 4 screws or so.) There is 24 volts there WHEN THE HEAT IS ON , run two new wires from those terminals to the solinoid and see if it passes water cuz that is when those terminals have voltage. Best way is with a meter though and if you have 24 volts at the solenoid AND no water, it is bad. If NO VOLTS, then could be the the humidistat or a disconnected wire somewhere in the path.

Dec 26, 2009 | Aprilaire Humidifiers

1 Answer

There is no water flowing, i just replaced the solinoid, could it be the humistat? 700 sieries aprilaire


Could be, test it...if you have an OHM meter, set it to resistance and disconnect the humidstat. With the humidistat set all way on, you should get 0 ohms, if not it is bad. You most likely have a wire not connected somewhere, You need to have 24 volts at the solenoid when the heater is on and the humidistat > than existing humidity %. That is the bottom line. So check first at the electrical plug that the transformer is plugged into, if it does not use a wall transformer, test the furnace circuit board to see that you are getting 24Volts from the HUMIDIFIER TERMINALS when the HEAT IS ON. Then check the humidistat like I stated above. Solenoid is good cuz you replaced it.

Dec 26, 2009 | Aprilaire Humidifiers

1 Answer

I have a aprilaire 112. How do you test the solenoid valve to determine if it working properly?


without using a meter? OK take the water line loose from the humidifier that connects to the solnoid. Turn the humidifier on or raise the humidity and water should flow. Keep in mind that if wired correctly the humidifier will only work when your furnace is running although some can be wired to bring on your furnace. You should hear or feel the click if no water comes out you may have no water flow as these valves are pretty durable and seldom fail

Dec 11, 2009 | Aprilaire 700 Humidifier

1 Answer

Water runs when furnace is not runnung


not wired properly or stuck solinoid. check for voltage to soliniod if it has voltage then its not wired properly if doesnt have voltage then its a stuck solinoid and the solinoid valve will need to be replaced. you can get from www.aprilaire.com

Dec 03, 2009 | Aprilaire 600 Humidifier

1 Answer

When the system calls for heat My Aprilaire 700 fan turns on, but the solenoid doesn't open up. The indoor humidity is around 35% now, outside temperature was around 35 with relative humidity of 75%. In...


do you hear a clicking at the solinoid? grab the solinoid and turn it on to see if its getting voltage, you should feel it energize. you can turn off the water supply and disconnect the water line from the solinoid. there is a black pre screen inside the inlet if you have a tiny flat heat screwdriver insert it into the inlet and turn it out. clean it and retry. you can also make sure the orifice isnt clogged its located on the outlet side of the soliniod. when you remove you will probably have a stream of water come out of the feed tube thru the orifice, even if it has sat all summer. if water comes out you dont have a clogged orifice. donot try to **** out the orifice if its clogged you will need to get a new one fron www.aprilaire.com . you can verify it clogged by after cleaning the prescreen reconnect the water line inlet and turn on humidifier if water comes thru the solinoid with the outlet feed tube not connected then the orifice is clogged. If you clean the prescreen and the orifice is fine ,still no water then you will need a new solinoid you should also be able to purchase from aprilaire. here is links to the solinoid and orifice

http://estore.aprilaire.com/catalog/humidifiers/all-humidifier-parts/299

http://estore.aprilaire.com/catalog/humidifiers/all-humidifier-parts/267

hope this helps,
Mac

Nov 07, 2009 | Aprilaire 700 Humidifier

1 Answer

Water keeps running to Honewell 360A Whole House Humidifier


You may need to replace the valve that is wired to the furnace that controls the water flow

Feb 01, 2009 | Honeywell HE360A1027 Whole House...

1 Answer

440 Aprilaire Humitifier small solinoid doesn't open


Make shure that the the filter in the bottom of the valve is clean. Turn water off use a 1/2 & 7/16 wrench to take apart the bottom connection on valve use a small screwdriver and push the small screen out and clean then put it back together.Use the same wrenches and take apart the top of valve clean inside valve and clean small orfice in plastic water line put back together. Make shure 24volts is gettin to valve you should her a click when furnace is running or fan. It may take a couple times to clean. Hope this helps

Jan 11, 2009 | Aprilaire 600 Humidifier

1 Answer

Honeywell 360a humidifier


yes water should turn off solinoid is bad

Oct 24, 2008 | Honeywell HE360A1027 Whole House...

2 Answers

Humdifier on furnace


I have the exact same problem. At this time I am looking for a new solinoid (part on the bottom) to install. Anyone else having this problem and know where to find replacement parts

Jan 22, 2008 | Aprilaire 700 Humidifier

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