Question about Aprilaire 700 Humidifier

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Water dripping from unit

There is water dripping from the unit.  I had someone replace the hose that is attached to the unit because the line was clogged. I thought the  problem was solved, but the water continues to drip.

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  • Jim Walker Feb 11, 2008

    Water runs out of the humidifier cover. Humidifier was new in October, filter looks exactly like it did when installed. Drain hose is clear, but doesn't run hardly any water. More water comes out cover & sprays down the furnace.

  • Steviek1 Feb 12, 2008

    My 700 is also leaking right through the bottom of the unit. I checked the lead hose and the drain hose and they are clear. I replaced the filter and cleaned the tray that holds the filter in place. What the heck is causing the water to flow out of the unit rather than down the drain hole? It appears to be level. thanks.

  • nguyen12 Feb 25, 2008

    I have the same problem. cleaned, change the filter but no work.

  • howsdebs Mar 24, 2008

    Same problem. Attempted to fix by replacing Scale Control, Water Distributor and Water Panel and still leaks. Will attempt to replace lead hose.

  • Jim Walker May 11, 2010


    My fan is sucking air from the plenem through the water wick filter into my humidifier case. The water droplets hit the back of the case & drip to the floor.

    The fan, (by my best mechanical notions) should blow the air through the water wick into the plenem and be distributed by the furnace's blower fan.

    How do i reverse the direction my fan runs?



6 Answers


Contacted Aprilaire this morning they said that the fan should indeed suck through the water panel, not blow.

He said if your water panel is upside down inside the plastic shrowd, it will leak. He told me that the water panel is shaped like an upside down christmas tree.... the water runs to the inside most core of the panel, not to the outside. If it's upside down, it runs to the outside instead.

I will check my water panel tonight. If it's installed correctly, I'm going to leave my fan blades reversed.

Posted on Mar 05, 2008

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I bent the aluminum blades of my fan to blow the opposite direction. It is now running leak free! Have tested less than an hour thus far. Will re-post tomorrow to see if it's still not leaking.

Posted on Mar 05, 2008

  • Jim Walker Mar 05, 2008


    I found my fan in the humidifier was running backward sucking instead of blowing. After bending the blades to blow air the opposite way, no leaks what so ever.

    Must be a factory defect..... I'm contacting Aprilaire today.

    12 hours running constantly and not one drip of a leak!



I discovered that the problem was simply a cracked, brittle lead hose and after replacing it, solved the problem. Thanks for the reply.

Posted on Mar 04, 2008

Same problem, tried everything but water still leaks from the bottom.

Posted on Mar 04, 2008

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I don't have a solution but I also have the same probem with my 760. It worked for 5 years, then the problems started. What a pain! I replaced the water panel, cleaned out any calcum buildup, etc and no luck. There must be a defect!

If I can't solve the problem sooon I will buy any brand of humidifier but Aprilaire.

Posted on Nov 18, 2008

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If the water panel needs to be replaced , this can happen. instead of going through the panel , water will run on the outside of the panel and drip through the seems on the humidifier cover. make sure the plastic hose that goes into the water panel is inserted into the water panel.

Posted on Dec 28, 2007

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I have a hose attached to the back of the unit and the tank is still filling up, and then of course shuts off when the tank is full. we have checked the hose and the back of the unit where the hose...

Nina, the clog is not in the hose connection. It's in the inner tubing of the unit. When this happens water is diverted to the bucket. to solve this problem, follow the instructions below.

First - Turn the unit OFF & Unplug it.

Using an appropriately sized, 18" long, plastic Zip Tie, carefully insert the tip of Zip Tie into the hose connection and the tubing. Continue to push it in until you reach a bend in the tubing. You will need to gingerly work the Zip Tie past this bend, until it either bottoms out or you run out of usable Zip Tie. Then slowly pull the Zip Tie back out while rotating (twisting) it. This will breakup any clogs. As you reach the inserted end of the Zip Tie, be prepared, as some water may follow. Reconnect the hose to the unit, plug the unit in and turn the Master ON/OFF Switch to ON. Set the humidity extraction level to 35% or Maximum if you have a manually controlled unit. Allow the unit to run, while you monitor the hose end for water flow. It may take 10 to 15 minutes for the water to start flowing again.

NOTE: If you don't have a Zip Tie, you may use something similar ( i.e.a long pipe cleaner), but NO wire coat hangers

I hope this information has helped you to solve the problem. Thanks for choosing FixYa.

Aug 23, 2011 | General Electric AHK30LK 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

Honeywell HE260 leaks somewhere

Neither, even if the solenoid or humidistat stick, it should always drain properly. Is the unit mounted on the cold air return duct or the supply plenum? If it's mounted on the supply plenum, the water panel might be getting blown forward and spilling the water. High efficient furnaces also can leak water on the floor if its drain is restricted. If hum. is mounted on return duct make sure drain is clear by blowing through it. On Honeywell hum's I've seen the rubber hose from the solenoid valve to the distributor tray leak too, check the rubber 1/4" hose.

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2 Answers

Water drips from unit

lift the frontup2 inches should drain out back if not blocked
thumbs up

Aug 17, 2009 | Aprilaire 600 Humidifier

4 Answers

Water runs out of the bottom of the unit

Check your plastic water orifice. It is in the hose fitting connected to the outlet tube of the water solenoid. It should be a blue one. Mine was completely eaten through, allowing full water flow, and thus overflowing the distribution tray. I replaced mine yesterday and no more water drips. May as well reflace the filter on the inlet tube of the solenoid at the same time. I used a piece of very stiff, but thin, wire formed into a small hook to remove both old parts. Replacements are readily available from multiple sources on line.

Feb 05, 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

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