[Tony Van Helden]

On the topic of thermostats, I have the 5 button Duo Therm that has become rather quirky. Zone 1 on heat has become the culprit of not kicking on anymore. It was rather erratic before it quit entirely. Zone 3 works fine and the half bath will push heat to the front. I've cleaned the board to no avail. Do I need to locate and clean some sensor or is it time for a replacement thermo?