An update on the problems with our roof air conditioners. When I talked to a technician at Airxcel some time ago he mentioned that if the switching valve solenoid was defective it could be replaced for around $20.00.
We got a break in the weather a couple weeks ago so I climbed on the roof and did a little diagnosis. As it turned out the solenoid was not getting power from the control board. I called back and explained my diagnosis. The technician offered to send out a new control panel at no charge. (The panel normally runs $150.00 to $200.00). He also offered to send out at no charge 2 three blade fan kits to minimize the interior noise.
I'm not sure if there was a problem with the units we have or they are just extending "goodwill". I didn't ask too many questions. Now if we could get another break in the weather I'll install the new parts and hopefully have fully functional and quiet air conditioners.