The fan is not currently running. when I went to get the model number info on the furnace I switched the fan on and it did not run, though several other times today I had switched it on and it started running right away. So I guess it got timed out somehow.
I will try what you suggest when and if this happens again, which it probably will. But can you tell me why tapping on the wheel inside the thermostat would shut the fan off?
also, when i went to check the inside of the thermostat i noticed that the wheel has two little notches in it, one at .25 and one at .3 which lock the wheel in place when I move the lever. Should one of those positions be used? None of the other numbered positions have notches that lock the wheel into place.
Also, would turning the thermostat down while the heat and fan are both on cause the fan to keep running when the heat goes off? That's the only thing I've done that might possibly have some effect. Also, should I as a matter of course avoid changing the temperature selection on the thermostat when the furnace is running and the fan is on?
am i correct that turning the fan off manually and leaving it off, like overnight, is a bad idea because the furnace might kick on and not having the fan on then would be a hazard?