Abstract: A rodent control device generates a pulsating, interrupted electromagnetic field via one or more coil(s) and induces it onto the power line wiring in a building via core(s) linked to the coil(s). The rodent control device circuit is microprocessor controlled which allows automatic sensing of line voltage cycle rates and precise control of coil switching circuitry. The coil(s) are connected to the microprocessor to provide a coil monitoring signal via which the microprocessor detects abnormalities in the coil(s) such as shorts or open circuits. Upon detection of such an abnormality, the microprocessor shuts off control signals to the coil and to an LED indicator until a normal coil condition is sensed. The microprocessor also provides a timed rest signal for shutting down the device for, for example, 2 minutes out of every 6 minute period as a power saving feature.