Hey Gene, I found a guy here that had a spare dampner. Put it all together and plugged it in and the dampner motor open up then closed and cycled like this 3 or 4 time over a 5 minute period then it just stayed closeed and 3 hours later it still appears to be closed. Still think its the adaptive frost control or is there something else that is susposed to keep the dampner open??

well im not sure but it appears to be functional. i mean its a 120 volt motor with a micro switch on the cam that interrupts power to the motor when opened. im assuming there is some sort of control that stops rotation at some point.. both the motor and micro switch appear to be operating as they should. i must admit i am unsure what it is that makes the dampner remain open at a certain point. im certainly not disputing your suggestion.. simply just wondering how it works.. i will see if this local guy has a spare controller and let you know. im guessing its the flat square box under the housing by the dampner about 3 x 4 inchs correct? thanks again Gene...

Hi! I just wanted to thank you, your info was very useful, change the fan motor, was pretty easy, everything is working fine, you are doing a great service, thank you so much. Eve

ok Gene, i got a thermostat control from Mr. Sellars and checked mine first. notta. installed his and wal lah. everything working great. thanks for the diagram. you are exactly right. thermostat controls dampner position.. this ones quite a bit more complicated than my whirlpool dampner system...thanks again...Jody

You are welcome Tom.

Most likely all three new parts will fix it, but there is a very small chance that without the proper diagnosis there is something else wrong.

Good luck,
Gene.