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Old 12-23-2010, 09:04 AM   #1
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Aprilaire 400 not working


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

Tariq
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Old 12-23-2010, 01:37 PM   #2
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Aprilaire 400 not working


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
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Last edited by hvactech126; 12-23-2010 at 03:32 PM.
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Old 12-23-2010, 02:41 PM   #3
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Aprilaire 400 not working


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

-Tariq
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