Abstract: An operation control circuit for pump motor which is made such that driving condition of pump motor is checked and then when its driving condition is abnormal than driving of the pump motor can be stopped.The operation control circuit includes a pump environmental temperature detecting and heater energizing section, an overload and no-load detecting section, an overload driving count section, a no-load driving count section, latch sections, a reset section, a pump motor driving control section, and an operating state display section.According to the invention, using life time can be extended by preventing overload and no-load operation of pump motor, and freezing break down of pump motor can previously be prevented, and opening and closing noise of switch can be reduced.