Question about Aprilaire 550 Humidifier

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Water Leak Aprilaire 550 mounted to furnace is leaking. Replaced water panel and confirmed no blockages on drains, cleaned all parts. Excess water is drained to a tray with a electric pump to waste line. Water is leaking from the outer case of the unit. It appears to much water is being put through the water panels and that water blows through the panel and leaks out of the case. What is the next thing to replace ? Thanks.

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  • Anonymous Jan 09, 2009

    I have an Aprilaire with same problem. The water is shooting out of the feed hose too fast and goes over the back of the unit then down the back to the bottom and drips out of the bottom. I put a butterfly paper clip on the top to act as a baffle to stop the water from pouring out of the back. It's working.......with very small drip to bottom of unit. The hot air dries it up before it leaks out of the unit.



  • Anonymous Feb 04, 2009

    I am having the same problem. The water is leaking out of the housing in the front and splashing on the furnace below. Had to turn it off in case water enters the furnace electricals. anyone have any solutions to fix this issue ?

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  • 15 Answers

There is a nozzel at the end a black tube at the top of the hummidifier that has come off or the tube is cracked

Posted on Feb 04, 2009

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Water leaks out from the bottom of the case ... just about where the outflow pipe is located. Additionally, large amounts of water are going out the out flow pipe. I am getting more than 2 quarts of...


YOUR HUMI IS IN NEED OF MAINTAINACE. THE CALCIUM DEPOSITS ARE CLOGGING THE THE SPONGE ROLLER THAT WOULD NORMALLY ABSORB THAT WATER, YOU ALSO HAVE THE HUMDITY SETTING RATHER HIGH THATS WHY THERES SO MUCH WATER. THE TUBE THAT IS LEAKING IS MADE TO DRAIN OFF EXCESS WATER FROM THE ROLLER AND THE REASON IT LEAKS IS BECAUSE IT ALSO NEEDS SERVICE JUST PULL IT OFF AND CUT THE SEWELLED PART OFF WITH RAZOR OR CUTTING KNIFE IF IT IS PLASTIC TUBING AND REPLACE IT. IT SHOULD BE DRAINING INTO THE DRAIN ON THE FLOOR WHERE THE FURNACE CONDENSATE TUBE IS.

Mar 05, 2010 | Aprilaire 700 Humidifier

1 Answer

Fan motor seems to be running backwards. Installed in 1999.Always maintaned. Overall worked OK until this past year. Many problems with water leakage. When I opened and checked fan direction, it was moving...


The fan on the model 700 does rotate backwards compared to your typical fan operation. This fan will pull air from the duct verses pushing air into the duct. There are several things that may cause your humidifier to leak. The most known reason for leaking is the water panel/filter is not being changed frequently enough which should be at least once every heating season. You also want to confirm that you are utilizing an authentic Aprilaire water panel.
  • Is the Feed Tube tightened or is there a crack in the tube?
· Is the base of the scale control insert sitting firmly in the drain spud at the base of the housing?
· Does the bottom of the scale control insert have a taper to it to direct water to the drain spud?
· Is the Scale control insert positioned correctly? The scale control insert has a front and a back. The back of the water distribution tray has an indentation in it to allow for clearance of the nozzle, which is attached to the top of the base. If reversed, and forced into place, the water distribution tray will break off the nozzle attached to the water feed tube and potentially the housing, causing water to leak
· Is there a gap between the top of the water panel and the water distribution tray for air to go through?
· Is the colored dot on the water panel, up?
· Are there signs of entrainment? Mineral build-up on fan blade, shroud, inside of cover?






Mar 02, 2010 | Aprilaire 700 Humidifier

1 Answer

Loud vibrating noise when the furnace blower starts up.


Try closing damper slightly between humidifier and furnace????

Feb 03, 2010 | Aprilaire 550 Humidifier

1 Answer

I have an Aprilaire 550 hooked up to my furnace,


in order for the humidifier to come on with the heater there has to be a temperature sense curuit to turn it on/off at a certain temp, the humidity curcuit on the unit will turn it off at set %

Jan 31, 2010 | Aprilaire 550 Humidifier

1 Answer

How much water should be draining from Aprilaire 550?


thats too much.. and a waste of water... you should install a good ball valve water shutoff inline and let it trickle.. ideally, it should be net zero water wastage but there's always a bit.. my water take-off drain runs about once every 5hrs and its about a litre (its siphoning water out of the combustion chamber as well as the waste water from the humidifier.. (you can get those ball valves at homedepot for about 6bucks -- they're usually compression fittings as well)

Jan 11, 2010 | 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.

Dec 28, 2009 | Honeywell HE260A1010 Whole House...

1 Answer

Aprilaire 550 makes extremely loud grinding noise when turned on


yes it should be bypass but solenoid could be trying to open but the voltage to it may be to low if you have 24v ac power at the 2 small wires. but to change shut down power to furnace and water to humidifier.you loosen the 2 compression nuts unwire they cant be reversed so dont worry then 2 mounting screws then reverse to install

Dec 17, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 700 leaks water from bottom of case


Install new water panels yearly. On the new panel make sure that the painted dot on the edge of the panel is on the top when you install it.
Always clean the distribution tray and the frame. Make sure the notch on the edge of the distribution tray faces away from the furnace. Make sure the humidifier was installed level. Keep the drain tube opening clear. Insure there is no blockages in the drain tube.
Good luck
HVAC Teacher

Feb 10, 2009 | Aprilaire 700 Humidifier

1 Answer

No water flow to the humidifier


Turn that pin to the left and that will open the valve to allow water to flow through it. If it starts to leak the all you need to do is tighten the nut that were the water is coming out with a wrench, be carefull it wont take much to tighten.

Dec 02, 2008 | Aprilaire 600 Humidifier

2 Answers

Water leak


your drain pipe is clogged up, going to drain- Duh

Jan 13, 2008 | Aprilaire 550 Humidifier

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