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Aprilaire 500 water won't stop running down to condensate pump

Condensate pump keeps running

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Hello, sounds like rhe solenoid valve is stuck open. This will keep water flowing through the humidifier even if the Furnace is off. The solenoid valve will have to be replaced.

Posted on Dec 02, 2012

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Posted on Jan 02, 2017

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SOURCE: water keeps running into humidifier even furnance blower is not

This sounds like, the 550 transformer is not connected to the blower motor power connection (in parallel)

Posted on Mar 04, 2009

  • 189 Answers

SOURCE: keep running

You should have a #50 relay hooked up to the main blower assembley to turn the 24 volts on and off with the blower to the humidistat. Alot of humidifiers sold do not tell you about the #50 relay. They assume that you are a hvac pro and you aready know about.
Good luck
HVAC Teacher

Posted on Mar 08, 2009

  • 189 Answers

SOURCE: My water never stops running into Aprilaire 112

Disconnect the two yellow wires. The water should stop. If it does you have a bad (or miswired) humidistat. If the water does not stop the solenoid valve is bad. These valves are known to be expensive. You might want to consider replacing the whole unit.
Good luck
HVAC Teacher

Posted on Mar 08, 2009

  • 2 Answers

SOURCE: aprilaire 600 humidier: water continuously runs

sounds like you may have it wired to a continuous power source vs one that shuts off with the furnace. The most common wiring is red to C & white to W

Posted on Jan 13, 2010

  • 1033 Answers

SOURCE: my aprilaire 600 continues to

Hello, usually when a humidifier continues to run with the furnace off it means that the solenoid valve is stuck open and must be replaced.

Posted on Feb 19, 2011

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1 Answer

After a few hours my Aprilaire 400 makes a constant clicking sound that won't stop. Is it the solenoid?


This is either the solenoid or a loose low voltage wire. Make sure all the wiring connections are tight, if they are the solenoid if bad and will need to be replaced.

Dec 14, 2012 | Aprilaire 400 Humidifier

1 Answer

The water basin that receives and pumps out the excess water on my Aprilaire 600 humidifier runs incessantly, even when very little waters in in teh basin? Is there an easy fix? thank you


If you are referring to a condensate pump then the float might be stuck and causing the pump to run continuously. The best thing to do is turn off power to the pump and clean it out and make sure the float is free and not stuck.

Jan 21, 2011 | Aprilaire 600 Humidifier

1 Answer

Aprilaire 600 humidier: water continuously runs


sounds like you may have it wired to a continuous power source vs one that shuts off with the furnace. The most common wiring is red to C & white to W

Jan 08, 2010 | Aprilaire 600 Humidifier

1 Answer

My Aprilaire 560 doesn't shut off even if the blower is off.


My Aprilair 560 turns on and off repeatedly.Making a loud banging sound.Changed my water valve worked 1 day and started agin.

Dec 20, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilair 760 Humidfier will not stop water flow to EV panel


If the water continues runs nonstop even when the heater is turned off, you might have either a bad solenoid valve or a bad humidistat. Simply disconnect one of the two low voltage wires going into the unit. If the water turns off then your problem is most likely your humidistat or the low voltage wiring. If the water continues to run even when the low voltage is disconnected you have a defective solenoid valve.
Good luck.......

Apr 09, 2009 | Aprilaire 700 Humidifier

1 Answer

Keep running


You should have a #50 relay hooked up to the main blower assembley to turn the 24 volts on and off with the blower to the humidistat. Alot of humidifiers sold do not tell you about the #50 relay. They assume that you are a hvac pro and you aready know about.
Good luck
HVAC Teacher

Mar 02, 2009 | Aprilaire 600 Humidifier

1 Answer

My water never stops running into Aprilaire 112


Disconnect the two yellow wires. The water should stop. If it does you have a bad (or miswired) humidistat. If the water does not stop the solenoid valve is bad. These valves are known to be expensive. You might want to consider replacing the whole unit.
Good luck
HVAC Teacher

Feb 19, 2009 | Aprilaire 1120 Humidifier

1 Answer

Water keeps running into humidifier even furnance blower is not


This sounds like, the 550 transformer is not connected to the blower motor power connection (in parallel)

Feb 19, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilaire pump motor rattles violently


You can add bleach in the pump to clean it is probably dirty you may want to do this every 6 months

Feb 02, 2009 | Aprilaire 700 Humidifier

1 Answer

Aprilaire 500 - Everything works, but humidity will not increase!


You should take out that aprilaire and throw it in the garbage or return it to who you got it from. Ask them why they didn't offer you the best humidifiers available. The only way to truly control humidity in your home without running your heat is a steam humidifier. Autoflo makes a good one also honeywell makes a new one. I have installed a honeywell tru steam in my own home and a few customers it hasn't lived up to its advertising. The auto flo has never given me any problems with customers.

Dec 18, 2008 | Aprilaire 600 Humidifier

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