Pump power cord not connected to power receptacle or making poor contact. Check pump cord cap prongs for tightness and corrosion. Replace plug or clean plug prongs with abrasive paper or have electrical receptacle replaced. Branch circuit not connected or defective circuit breaker. Fuse blown or circuit breaker tripped.Test for power with light bulb. Check fuses & breakers. Replace fuse as required. Note size recommended by pump manufacturer and pump nameplate rating. Use slow-blow type to withstand starting load or reset circuit breaker or call an electrician to repair the circuit. Branch circuit wiring too small to carry pump load. Have line voltage checked and compare with manufacturer's specifications. Have pump connected to separate branch circuit. Call electrician to repair circuit. Pump motor overload tripped. Allow pump to cool for 5-10 minutes and reconnect, if overload trips again take corrective action. Have line voltage checked and compare with manufacturer's specifications. Have electrician or power company check branch circuit voltage. . Have pump connected to separate branch circuit. Return pump to Authorized Service Center. Automatic liquid level control switch defective. Remove pump, disconnect power, connect to rated voltage and actuate control switch. Readjust control floats or weights. Return pump to Authorized Service Center. Internal motor defect Remove pump, disconnect power, connect to rated voltage and actuate control switch. Return pump to Authorized Service Center. Exceptionally low voltage. Have line voltage checked and compare with manufacturer's specifications. Have electrician repair the circuit. Call Power Company. Impeller blocked or bound. Disconnect power, remove pump from sump and observe for freedom of impeller and shaft rotation. Clean volute and impeller and remove any blockage. Return pump to Authorized Service Center. Bearings frozen. Disconnect power, remove pump from sump and observe for freedom of impeller and shaft rotation. Free and lubricate lower bearing of column pump. Replace pump bearing. Return pump to Authorized Service Center. Water temperature too high. Observe source and amount of water inrush. Measure water temperature. Add cold water to sump and test. Install high temperature pump or reduce temperature of incoming water. Water level not sufficiently high to actuate control switch. Add water to sump and observe turn-on. Readjust control floats or weights. Float operation obstructed or restrained. Add water to sump and observe turn-on. Readjust control floats or weights. Float rod bent or obstructed by debris. Examine and observe. Readjust control floats or weights. Return pump to Authorized Service Center. Diaphragm control skirt lost trapped air. Manually override control to check pump operations, if override is provided by manufacturer. Lift pump above fluid level in sump. Then holding pump straight and vertical, place pump back into sump to retrap air in control skirt. Moisture in breather tube. Examine and observe. Remove source of moisture such as dripping pipes, washing machine discharge splash etc. Plug cord into receptacle upside down to prevent moisture from entering breather tube. Return pump to service center for new power cord. Passage from control skirt to diaphragm obstructed. Examine and observe. Clean passage way. Compression fittings retaining pressure tube between control skirt and control are loose.Examine and observe. Tighten fittings. Then lift pump above fluid level in sump and holding pump straight and vertical, place pump back into sump to retrap air in control skirt. Defective control switch. Manually override control to check pump operations, if override is provided by manufacturer. If overridden control operates pump, but pump fails to function automatically, return pump to a service center. If override does not operate pump, pump motor is defective. Return pump to service center.