Question about Aprilaire 400 Humidifier

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Aprilare 400 - will not run

Im not getting any water to the inside pad , I have checked the insert filters , the valve off the waterline- nada. Can it be the selenoid - unit is onoy 5 years old,

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It could be the solenoid or the motor,also if it runs but does'nt get water check the float switch

Posted on Feb 07, 2010

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Posted on Jan 02, 2017

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1 Answer

If i hook my Aprilaire 400 Manual (not auto/digital) humidifier up straight to a 24v wall outlet instead of to the furnace, will it still work correctly? Or does it need to be powered by the furnace to...


Your humidifier is a bypass type. The only voltage needed is 24vac to open the water valve. Air only flows through the humidifier when the furnace blower is running, and the wet pad will add very little humidity if the furnace is not running and heating the air before flowing through the wet pad in the humidifier.
It is best the water valve is only energized when the furnace is running. Some furnaces have a connector on their control boards labeled HUM for this purpose. Test it's voltage when the furnace is running because some will output 110vac instead of 24vac you need.

Jan 31, 2013 | Aprilaire 400 Humidifier

1 Answer

I hear no water draining from my heathy soluions lennox humidifier just put in a new filter


None leaking? 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.

Jan 06, 2013 | Humidifiers

1 Answer

I have a honeywell he220a humidifier . the water drips in but does not get the filter pad wet.


Open the waterline tap valve or may have to clean small orifice that is in line where 1/4" line meets humidifier. Need to shut water off and in screw nut holding copoet line to humidifier

Jan 22, 2011 | Honeywell HE265 Humidifier

1 Answer

Aprilaire 400 humidifier. No water flowing to the pad. I've checked the supply -- working. Replaced the solenoid, not working. Checked the electrical to he solenoid wnen system callilng for water -- no...


Check to see if you are getting 24 volts from the transformer, if not, turn off power to the transformer and check the resistance of the secondary side, if no resistance the transformer is bad and need to be replaced. Also check to make sure all the wires are secure. If you are getting voltage at the transformer then bring power directly from transformer directly to solenoid valve and it should click open and let the water through, if it does then either the sailswitch/current sensing relay is bad or humidistat is bad.

Jan 17, 2011 | Aprilaire 400 Humidifier

1 Answer

Our aprilaire humidifier is only 4 years old and it does not seem to be working. We have static in the house and when I did test mode it never drained water like it was supposed to. Any ideas what I can do...


Hope this helps, check and see if humidistat is set to 35% humidity and that bypass damper on humidifier is in the open position or winter position.(humidistat is usually located on cold air return duct near furnace). Next, replace humidifier media pad, remember to replace media pad (filter) annually, you also may want to clean any lime deposit out of humidifier housing with a solution of warm water and white vinegar before installing your new media filter.Remember to turn power off at side of furnace when cleaning humidifier and replacing media. Before installing new media turn power back on to furnace, set humidistat to the on position, turn furnace thermostat above room temp., and inspect humidifier to see if water is running from top,(you may want to have a bucket under humidifier when checking for water), if you see water running, turn power back off to furnace, properly install new media filter, reconnect humidifier cover & set humidistat to 35%. If you do not see water present, check water supply valve to humidifier and make sure its turned on. If water supply valve is open, then check water supply tubing for blockage.And the last things to check is to make sure all registers through out your home are open and not blocked by any objects, also make sure furnace filter is cleaned, if none of this works refer to installation manual to see if humidifier was sized and installed properly, Good luck.

Mar 03, 2010 | Aprilaire 600 Humidifier

1 Answer

Water doesn't shut off completely (drips) when furnace is OFF. Water doesn't increase to a stream when furnace is ON. Also, black connection (regulator ?) between copper water pipe (inlet) and black...


Hi i would check you water line see if they are blocked and checkout the valve and the jet inside where the water goes donw the pad they could be blocked

Feb 11, 2010 | Aprilaire 550 Humidifier

1 Answer

Replaced celinoid because of loud humming and now water will not go thru filter !!! what the -----------?


When you replaced the solenoid valve did you clean the orifice? It is in the waterline by the solenoid valve It is a small plastic plug with a very small hole. Pull "one" wire out of a wire brush. This should be small enough to poke though to open the orifice.
Good luck

Mar 21, 2009 | Aprilaire 700 Humidifier

1 Answer

Honeywell HE220A water not reaching humidifier


Replace the Valve on the unit. Check the small filter inside of it where the waterline attaches first. If its clear and you have lots of flow from the 1/4" line the replace the valve.

Jan 19, 2009 | Honeywell HE220A1019 Whole House...

2 Answers

Routing waterline to pad


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!

Dec 10, 2008 | Aprilaire 550 Humidifier

1 Answer

Holmes HM5601 quit working


I had the same problem with my Holmes HM5601 humidifer unit - right out of the box. I almost returned the unit to the store, but was able to figure-out the problem. Not enough water had been filling the heating section (where that black knob-like protrusion is) and the lack of enough water had caused the unit to shut-off soon after plugging it in. The problem is in valve at the bottom of the water tank! The valve is a factory defect. It needs to open more when you sit the water tank onto the base so water fills the reservoir. I had solved the problem by going to the hardware store and purchasing some small, rubber pads or feet. These rubber pads are the type used to place under things where you want to protect a table-top from being scratched or you want the item not to slide too easily on a table-top. These rubber feet or pads have an adhesive on the bottom of them. Find the size that matches the diameter of the valve stem on the bottom of the water tank. Once installed, the valve should open and close with your finger without the rubber pad interferring with the operation of the valve. The pad, if installed properly, makes contact with the water reservoir base when you placed the water tank down onto that base. The valve open a bit more allowing water to pass-thru and fill the water reservoir. Water fills the heating section as needed and the unit runs perfectly after! The round rubber pad I had used was about an 1/8 inch thick and 1/2 inch in diameter.

Nov 30, 2008 | Humidifiers

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