Is the pump turned “ON”? Does the reservoir have enough water to raise and trip the low water level switch, if applicable, to allow pump to turn “ON”? Is the pump/hose positioned flat allowing it to prime itself. You may need seat it firmly against the bottom to assist with priming. Do you have correct voltage to the pump? Have qualified electrician check voltage supply from inside the control box, at the back of touch pad faceplate or the “toggle” switch, as applicable, depending on the unit you have. If voltage is present, then replace faulty pump. If not, ensure connection points and wiring are good. Replace control box lid assembly, touch pad control plate, or switch as necessary, in order, to get proper voltage to the pump.