"It is getting water supply in and out of the solenoid.Loosened the
compression fittings and inlet and outlet dripped ok but the media
panel is bone dry,never been wet. "
There are three things not right here.
First, after water leaves the solenoid, it only goes through a short
tube right to the top of the water panel. On the test setting, the
solenoid should be energized and water should be coming out of the
drain line. You say you here the solenoid energize, but no water
shows up? Not sure on your particular model, but on my 760 there is
a small filter screen on the inlet side of the solenoid and a small
plastic restrictor with a hole in it to limit the water flow on the
outlet side of the solenoid. Either of these could be plugged, though
they shouldn't be in a new unit. If you investigate this, be aware
that to take the filter screen out generally requires using an ice
pick, which will destroy it. The flow restrictor can be removed and
replaced without damage. Both these parts are only a couple bucks, are
available online and are maintenance items you should have anyway.
Second problem is in the test position, the fan should also be running.
What did Aprilaire tech support say about this?
Did you verify power to the outlet? Verify that all connections are
good, housing is closed correctly, etc?
Third problem is any tech that installed one of these and didn't see a
problem with no water running out and the fan not on in the test
position is incompetent.
I'd investigate some more and then call Aprilaire tech support again if