MOTOR THERMAL OVERLOAD LOCATION BLOWS - Makita Air Tools & Compressors

There are a few possible reasons why your AOSmith 1hp lift motor starts and then trips the breaker:

1. Overload: The motor may be overloaded and drawing too much current. Check the load on the motor and make sure it is within the motor's capacity.
2. Short Circuit: A short circuit could be causing the motor to draw too much current and trip the breaker. Check the wiring for any signs of damage or wear.
3. Faulty Motor: The motor itself could be faulty and causing the overload or short circuit. Check the motor windings for any signs of damage or wear.
4. Tripped Thermal Overload: The motor may have a thermal overload switch that shuts off the motor if it gets too hot. Check the motor for any signs of overheating and reset the thermal overload switch if necessary.
5. Faulty Breaker: The breaker itself could be faulty and tripping prematurely. Check the breaker for any signs of wear or damage.

It is recommended to consult a licensed electrician or motor technician to diagnose and fix the issue, as working with electricity can be dangerous if not done properly.

motor humming -- replace the start/run capacitor
no noise at all --- press the thermal overload button or replace the thermal overload switch

All microwaves have a door open switch that keeps the magnetron from producing microwaves; this could be your problem. Most microwaves have a fuse hidden in the wiring that blows on overload like a lot of food spatter inside. They also have thermal overloads which may or may not self reset. If it died with a big flash you may be out of luck, if not you may be able to locate the fuse or thermal limit and replace it. Another sneaky part is a one time combination temperature and current overload called a thermal fuse:
These thermal fuses are marked in amperage and degrees Celsius and Amazon carries them.
Self resetting thermal overloads look like this Amazon # B00DM8JGQQ which is a Whirlpool part:

I didn't find a wiring diagram on line for your model, but you may be able to find one; whirlpool generally is pretty good with documentation. Most microwave manufacturers keep consumers as far from doing their own repairs due to the possible dangers involved.
Appliance Parts Store has a pretty good selection of replacement parts
WMH31017AS Parts

The thermal overload (fuse) is found on the motor for this washer. It is a small black box that has 2 wires going to it. Unplug the washer before working on it. If you have a multimeter you can remove the wires going to the thermal overload and check for continuity between the two terminals of the thermal. If your meter shows an open circuit you will need to change the motor.

I think the question is thermal overload on a three phase motor. If a motor has a thermal overload that must be manually reset then there should be a button on the motor, often red. While the motor is de-energized (power plug removed) , push the reset button by hand.

The motor has a manual reset thermal overload protector switch. If the motor overheats for any reason, the overload protector will shut off the motor. The motor must be allowed to cool down before resetting the overload switch and restarting. It is located on the motor housing on the side opposite where the pump and hose connections are. The reason this switch shuts off is because of low voltage problems caused by either a too low amp rating on the circuit it's plugged into or by using an extension cord. It is always safer and better for the motor to run longer air hoses than to use extension cords.

More than likely the motor is overheating or at least the thermal overload thinks it is. The thermal overload could be bad but if the motor has burnt windings then it probably is pulling too many amps which will cause the overload. Sounds like you need a service call or take the motor to a motor shop.

A TOC is a bi-metal strip in a canister , they are normally placed on the motor windings and in most cases are auto-resetting.

All they do is sense the temperature of the windings and when they exceed the limit of the TOC (Which is set by the motor maker) they flip the Bi-Metal strip and open circuit the supply.

Normally once the motor has cooled down the strip relaxes back to the original position and the supply is restored.

It is not a standard practice to have a push button re-set however on that will depend on the makers whims

What you may have is a Thermal Fuse which melts if the motor gets too hot and you then need to strip the unit down to both check it and if possible replace it.

By looking at the rating plate on the motor you may find the manufacturer and approach them for a data sheet

I had the same problem and the solution was to manually press the thermal overload button. The button is located under the tool box next the motor head. I do not believe I tripped the thermal overload during use, but I suppose anything is possible. I’ve been using the compressor in sub 40 deg F. temperatures. I found the following in the Owner’s Manual, but had to look at the part manual to locate the switch.
MOTOR THERMAL OVERLOAD
PROTECTOR: The electric motor
has a manual thermal overload
protector. If the motor overheats
for any reason, the thermal
overload protector will shut off
the motor. Turn pressure switch
to the “off” position and wait for
unit to cool before pushing the
reset button and restarting the
compressor.

Good Luck!