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.
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