Possible causes	Recommended action
Obstacle is hitting the float.	Clear the obstacle.
Power failed.	Contact the electric power company and take measures.
Unbalanced power supply voltage.	Contact the electric power company and take measures.
Large voltage drop	Contact the electric power company and take measures.
Open phase	Inspection of wiring and magnet switch
Defective power circuit connection	Checking the Power circuit
Incorrect wiring of control circuit	Wire correctly
Fuse is blown.	Replace the fuse.
Defective magnet switch	Replace the magnet switch.
Malfunction or failure of level switch.	Repair or replace the level switch.
Short circuit breaker is turned actuation.	Repair short circuit section.
Pump is clogged.	Remove the foreign objects from the pump.
Electric motor burned	Repair or replace the motor.
Damaged electric motor bearing	Repair or replace the motor.
Mechanical Seal Sticking	Replace the mechanical seal.