Hi I have a maple/chase 9600 thermostat when I turn the heater on it blows the 3amp fuse in the thermostat. The auto fan works with the blown fuse but nothing else. Could a bad thermostat blow the fuse or from the heater a/c unit?
Thanks
Tom

Probably something in the furnace blowing the fuse. What is the make and model number of the furnace?