My thermal fuse went out. Do these go out often and if so, how often. The unit is about 10 years old if not more so, this is the first time I know it is being replaced.
Answer Hello Abbass,
The thermal fuse normally goes out due to excessive current flow through it, causing sufficient heat to open it. This is normally caused by a motor winding shorting or a heating element inside the unit going into failure. It can also be caused by a wiring harness or a bad breaker. A common failure I have seen repeatedly is a wire nut where the power supply connects behind the kick panel becoming loose and burning off. This is not a fire hazard as most customer state, but it will stop the unit in its' tracks. Anything that can cause an excessive current flow can open the thermal fuse.
Think of it like this: An excessive current flow is like water flowing through a pipe. If too much flow is in one part of the circuit, it is in all of the circuit. For this reason, the unit needs to be thoroughly checked out to prevent a repeated failure.