Question about Aprilaire 700 Humidifier

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Humdifier on furnace

Water supply in humidifier always spraying onto filter when unit is turned on

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Check your humidistat for proper operation, when full off,, you should get infinite ohms using an ohm meter. Make sure wires are not shorted on the humidistat. Quick test is to diconnect one humidistat wire and unit should never turn on. If it turns on, then it is not wired in series. If the water stops flowing when the voltage is not on, but water flows when energized then your solinoid IS GOOD and you must check your humidistat and furnace electrical connections.

Posted on Dec 26, 2009

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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

Posted on Jan 26, 2008

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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.

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1 Answer

Why does so much scum and mold develop in the water tray and on the filter ?


Mold and algea form in the tray and filter of drum style humidifiers because humidifiers are a warm damp place, perfect breeding grounds! I suggest updating to a drain through style humdifier, as it does not allow water to sit stagnent in a tray. Hope this helps

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1 Answer

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Is the furnace fan set on auto or on. You will get better humidity if you keep the fan on. It won't add much to your electric bill because many of the newer furnaces operate the fan on DC voltage. Try it!

Jan 16, 2010 | Aprilaire 700 Humidifier

1 Answer

No Water Flow to Honeywell Enviracaire HE225A1006 Humidifier


I have same problem with no water flow on identical humidifier but was able to fix it. Removed the inlet to the solenoid valve and found (1) a small taper mesh filter inside (2) a small diameter orifice that was clogged. Cleaned the miniature filter and used a sewing needle to open the orifice and now works perfectly.

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1 Answer

Water runs out back humidifier into plenum & onto floor


Hi John Your whole question did not show up (maybe you can re-post) . I can answer what part i understand though. If the humidifier was wired in right it will not send power to the humidifier until the furnace is on, and calling for heat. This stops the unit from working in the cooling mode in summer.Make sure your furnace filter is clean as well

Hope that helps

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1 Answer

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24v ac cyliniod on the water line, probably mineral deposits or just went bad, it gets its power from the terminal board on newer units have a humidifier output on them, check there to.

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1 Answer

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

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1 Answer

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I would suggest turning up the humidistat (usually located on the the return air duct to a higher setting and listening for a "click" noise on the supply valve. If you do hear a click but dont see / hear any water than the culprit is likely the valve itself.

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1 Answer

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Sounds like the air flow is too great and it is blowing the water in the bottom of the tray around before it gets a chance to drain. Try placing your summer, winter damper at half closed to slow the airflow down a little.

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1 Answer

Water is constantly filling


Have you checked the position and function of the floats in the pan?

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