Aprilaire800 Won't Stop Producing Steam


  #1  
Old 12-03-19, 04:16 PM
J
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Aprilaire800 Won't Stop Producing Steam

My unit is producing steam 24/7, even when the thermostat (Ecobee 3) is not calling for steam. I shut the HVAC off, and the 800 still was producing steam. I have the humidity set to 30% but it's all the way up to 60% now.

The user manual just says to shut the unit off and call someone.

Any troubleshooting ideas? My current EcoBee wiring looks like this:
https://i.imgur.com/BmCR2zd.jpg

With the exception of having an additional wire going into the "acc+" terminal. Also note: Despite the red wire going into the RH terminal, EcoBee shows/highlights the RC terminal as being connected...

I'm also using a fan relay that looks like this:
https://i.imgur.com/LHyOjZ4.png

So, all else the same, I have an additional blue wire connected from the furnace control board that's wired to that relay...
 
  #2  
Old 12-03-19, 09:12 PM
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Disconnect the J12-1 and J12-2 connections to see if it's in your control wiring or the humidifier itself.

Are you using a Fan Pack ?
If your wiring is ok then it may be a bad control board. they use relays that can become stuck on. Not an easy DIY service item. I believe that uses the 4981 control board.
 
 

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