[DQDick]

Here's what the deal is, there is a controler in the AC that gets the signal from the thermostat and then directs it to the AC, furnace or heat pump that's why it could be the problem. On the old units you could access it from inside the rig but on the whisper quiet models you need to access it from the roof. Since there's been ice and snow up there that's why we are going to replace it last if it comes to that. Once the controler in the AC unit sends the signal to the furnace then the furnace has it's own control board and along the way there is a self reseting fuse. The thermostat, AC control board, furnace control board and the self reseting fuse are all possibilities for issues like this. It's easier to diagnose when the weather is better because if we could run the AC and/or heat pump long enough to see if the problem happens with them also then we would be down to the thermostat or the AC control board as the problem but we werent able to do that so we took the most likely and then worked our way thru the ones I had a spare for. Since I don't have an AC control board and it's harder to get to, it's our last choice if replacing the thermostat today didn't do it.