We have a problem with a 15A breaker repeatedly tripping. This circuit seems to be servicing the thermostat, and could possibly power the blower motor. It will work fine for a few hours, maybe even a day or so, but then randomly the breaker will trip. Last winter we had the glow plug replaced for the heater, and the service tech mentioned something to me about the blower motor making noise and possibly going out, like the bearings might be beginning to fail. I haven't found any other power draw on that circuit that would cause an overload.
Could the motor failing be the cause of the overload?
What is the likelihood that both the blower and the thermostat are on the same circuit?