Question about General Filters 1099-LH Humidifier

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Water runs out of humidifier drain line constantly(rushes out)

Humidifier problem

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Most modern humidifiers use a constant drain to flush mineral deposits, and to keep the water fresh at all times. This keeps the unit from holding standing water. This keep the water fresh and prevents mold spores from infesting the air in your home.
HVAC Teacher

Posted on Mar 09, 2009

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Water leaking / running from top of humidifier


humidifiers have a drain and if there is water going in it will be coming out the drain. check drain to see if it is clear, check hoses going into top of humidifier for cracks, check filter in humidifier.

Feb 05, 2014 | AutoFlo 250 Humidifier

1 Answer

Water drains into air return & onto floor


Hello, usually this is a sign of a drain problem or the water is entering the humidifier too fast. If the water is not draining at the end of the drain line something is preventing the water from flowing. I would also make sure that there is no heavy mineral buildup on the water panel pad this can cause water to leak out of the humidifier. Lastly check to make sure there is a orifice inside the supply water tubing leaving the solenoid, if not this causes the water to enter the humidifier too fast.

Jan 07, 2012 | Aprilaire 550 Humidifier

1 Answer

760 aprilaire humidifier does not let water to the filter. I have cleaned and checked the lines in and out of solenoid.


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  1. No click at the solenoid valve indicates an electrical problem. Contact your heating and air conditioning dealer to further check the electrical components of your Aprilaire Humidifier.

  1. The click sound at the solenoid valve indicates there is electricity to the solenoid valve. By turning the dial of your humidifier control to a setting above the “click point” you should see water coming out of the drain line within a few minutes which would indicate your humidifier is working.

  1. If the solenoid valve makes a click sound and there is no water draining from the unit, this would indicate the flow of water is being obstructed.

1. To determine if water flow is being obstructed, turn the dial of your humidifier control to the off position. The first location you would want to check for an obstruction would be at the saddle valve located on the water line supplying water to the humidifier. When checking the saddle valve, you want to make sure it is completely open. This can be done by turning the valve all the way to the left. If anything is clogged, it can be dislodged by turning the saddle valve all the way to the right and back to the left. Once this is done, turn the humidifier control dial above the click point and you should see water coming out the drain line.


If water is still not coming out of the drain, check the orifice and in-line strainer to make sure they are not clogged. The orifice is located in the tube on the discharge side of the solenoid valve and the in-line strainer is located on the inlet side of the solenoid valve. You may clear the orifice by inserting a needle through the small opening. Clean the strainer by running it under warm water to dislodge deposits or replace. After clearing and re-installing the orifice and strainer (be sure to double wrench all water connections), turn the humidifier control dial above the click point and you should see water coming out the drain line.

Mar 10, 2010 | Aprilaire Humidifiers

1 Answer

Water running after heater shut off in humidifier


Hi check power at transformer / valve on water line could be stuck open clean valve out or transformer holding valve open

Dec 31, 2009 | Aprilaire 558 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

Water pours out the tube from the lennox humidifier


A small discharge of water coming out of the bottom of an April Aire drain spud is normal. This feature constantly tries to rinse the system. This helps to prevent the possibility of mold or bacteria accumulating in the unit from standing water. It may appear to be alot of water. But be reassured that you are breathing in cleaner air. Now if it continues to drain constantly even when it is turned off then you should repair the unit.

Apr 04, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 560 constantly drains water


check to see if you have 24 volts between to 2 yellow wires coming out of the water solenoid. if you have 24v, then it is still getting energized to run. if it does not have 24v and the water is still running, the solenoid is stuck open. most likely from water deposits. sometimes you can take the solenoid apart and clean it, but probably better off just getting a new solenoid.

Feb 07, 2009 | Aprilaire Humidifiers

1 Answer

Water flow to my model 600 seems to be too quick. It splashes all over inside my furnace duct and over fills the drain causing water to run all over the floor. Could this be a bad selonoid?


It is not likely to be caused by the selonoid valve. The selonoid is designed to be either open or closed, so if the unit is calling for humidity, it should be 100% open allowing as much water as possible to flow through. In cases of a bad selonoid, it will usually stick open or stick closed, but I have never heard of one allowing too much water through. Check to make sure your drain is clear and that the incoming line to the humidifier is positioned properly on the inside of the unit. If this doesn't solve the problem, it could be that the water line to the humidifier is too large, allowing more flow than the unit is designed for.

Dec 16, 2008 | Aprilaire 600 Humidifier

1 Answer

Water leaking from the bottom of the humidifier


Make sure the bottom port on the humidifier is seated properly in drain port. Make sure your drain line is not obstructed.

Feb 25, 2008 | Aprilaire 700 Humidifier

2 Answers

Water flow through humidifier


I installed this humidifier (and had a lot of trouble installing it!) and was surprised by the flow of water. Mine leaks out of the bottom of the unit so I haven't actually used it yet. I'll try to figure out why it's leaking this weekend. I thought there would be less water flowing through the pad. I suspect that the weight of the unit is causing it to not be plumb so some water is dripping off of the pad and past the drain tray.

Nov 30, 2007 | Honeywell HE360A1027 Whole House...

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