Question about Aprilaire Humidifiers

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My Aprilaire is working but my stat runs backwards in the off position it runs and as I turn it up it goes off I reversed the wires and the same thing. Is my stat need to be replaced. Manual 2 wire

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Sounds to me that u used a thermostat instead of a humidistat , they aren't the same thing (I think you see the differnence )

Posted on Dec 13, 2016


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Have a new evaporator to install, and directions on box say to "1. Note Humidifier Control setting and turn dial to "OFF" position." ... however, there is no dial, at least, not on the...

They are talking about the Humidistat which is separate to the Humidifier. Turn the power off to the furnace and that will disconnect any power to the humidifier. Turn the water off to the Humidifier if you have to remove it from the plentum. Then go ahead and install your new evaporator. If you are looking for the humistat follow the T-stat wire and see where it goes from the water valve of the humidifier...... But they may not have installed one and are useing a different way to turn the Humidifier on in the heating cycle.....

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Feb 23, 2010 | Aprilaire 700 Humidifier

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Dec 22, 2009 | Aprilaire 700 Humidifier

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I assume the temp dial you are referring to is the humidistat. If it only works when you apply manual pressure. You have bad contactsin the humidistat. Replace the stat.
Good luck
HVAC Teacher

Feb 02, 2009 | Aprilaire 600 Humidifier

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Aprilaire humdiifier not working

Does your humidistat have any dip switches or a small jumper wire? if it does try switching positions of the jumper or change dip switch. hope this helps

Jan 29, 2009 | Aprilaire 700 Humidifier

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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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Turning on the humidifier shuts off the furnace

It is possible you may have wired it wrong. Make sure your humidifer is not robbing power from your thermostat. This would explain when your humidifer makes a demand to come on it robs power from your t-stat making it lose its call for heat. Wire your humidistat to the "w" terminal and the common terminal so it only runs on a call for heat. With the bypass type of humidifier you purchased it wont do you any good to run when the heat isn't running anyway. If you want an independent operation humidifier you need a steam type.

Dec 02, 2008 | Aprilaire 600 Humidifier

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Aprilaire 700 operating at wrong time

You want the humidifier to run in heat mode which is the r-w1 terminal on the stat.

Nov 17, 2008 | Aprilaire 700 Humidifier

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