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Also, if your system is oil-fired, you may find a "reset" button on top of the injector pump. This may be tripped because of a fault with the injector pump. Follow the instructions to reset it. If it trips again, you‚Äôll have to wait for the repair man. One of the reasons it can trip is because the shutoff valve for the oil tank is closed. This prevents the pump from being able to draw oil from the tank, and the overload this causes trips the circuit. The valve may have been closed due to end-of, or off-season maintenance or tank repair. Make sure the valve is open. There may be more than one valve.