Originally Posted by whmprt
This is the Duo-Therm comfort contol for the AC and furnace.
2003 Beaver Contessa
I have the service manual for it if you would PM me your e-mail address, I will send it to you. I had a problem with mine and at the price of replacment, it was cheaper to replace than have it serviced, I found it on-line somwhere, can't remember where, for $62.00.
You may want to try a reset, can do that by unplugging the back and repluging it back in.