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tariqk 12-23-2010 10:04 AM

Aprilaire 400 not working
2 Attachment(s)
Hi folks,

I have an Aprilaire 400 connected to my HVAC/forced air heating unit which doesn't seem to be working. I've tried the following:

- Followed instructions from Aprilaire to test/check the humidistat. I hear the clicks, but don't see any water coming out.
- Changed the water panel, however the humidistat 'change water panel' light is still on (see attached picture)
- checked the water pipes and pump but see no obvious problems.

I live in Long Island NY, and the inside humidity is 25% irrespective of the outside humidity.

It'll be great if any DIY experts can let me know if I can do anything else before calling a professional to look at it.

Thanks in advance for your help


hvactech126 12-23-2010 02:37 PM

remove the water lines from the solenoid valve. Incoming side inside the valve is a screen. use a screw to get it out. it may be plugged. on outgoing side of valve is a orifice. It may also be plugged

tariqk 12-23-2010 03:41 PM

Thanks, I'll try it and post the results.


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