-10-
(8) Trouble shooting
The pump does not start.
The pump starts, but it
immediately stops.
Obstacle inhibits the float movement.
Power is failed.
Large fluctuation of power voltage.
Large drop in voltage.
Phase is lost.
Insufficient connection of power source
circuit.
Wrong wiring of control circuit.
Fuse is blown.
Defective magnet switch.
Mal-functioning or defects of float switch,
etc.
Actuation of ground fault breaker.
Pump catches foreign matter.
Motor is burnt out.
Break of motor bearing.
Mechanical seal stuck.
Remove the obstacle.
Request the electric power company for
action.
Request the electric power company for
action.
Request the electric power company for
action.
Inspect the connection section and the
magnet switch.
Inspect the power source circuit.
Wire in correct state.
Replace with adequate fuse.
Replace with adequate magnet.
Repair or replace the level switch, etc.
Repair the electric-leak section.
Remove the foreign matter.
Repair or replace the motor.
Repair or replace the bearing.
Repair or replace the mechanical seal.
The pump can be
operated, but it stops
after a while.
Prolonged dry operation induced the
functioning of Auto-cut.
High liquid temperature induced the
functioning of Auto-cut.
Raise the water level.
Lower the water level.
Thermal protector is
actuated.
Reverse rotation.
Broken gate valve.
Large voltage drop.
Operating the 60Hz pump at 50Hz.
High discharge head.
Large piping loss.
Low operating water level causes air
suction.
Liquid leaking from discharge pipe.
Clogging of discharge pipe.
Adhesion of foreign matter in suction
opening.
Foreign matter clogs the pump.
Worn impeller.
Establish correct rotational direction,
(refer to (6)-2-b)
Repair or replace the gate valve.
Request the electric power company for
action.
Check the nameplate.
Review the plan.
Review the plan.
Raise the water level or lower the pump
position.
Inspect and repair the discharge pipe.
Remove the foreign matter.
Remove the foreign matter.
Disassemble the pump to remove the
foreign matter.
Replace the impeller.
Large fluctuations of power source voltage.
Significant voltage drop.
Phase is lost.
Operating the 50Hz pump at 60H.
Operating the pump in reverse rotation
state.
Low head resulting in excess flow rate.
Pump caches foreign matter.
Motor bearing is broken.
Request the electric power company for
action.
Request the electric power company for
action.
Inspect the connection section and the
magnet switch.
Check the nameplate.
Establish the correct rotational direction,
(refer to (6)-2-b)
Narrow the opening of the gate valve. If
no gate valve is used, replace the pump
with the one having lower head.
Disassemble the pump to remove the
foreign matter.
Repair or replace the bearing.
Pump vibrates,
generating large noise.
Pump is in reverse rotational direction.
Pump catches foreign matter.
Piping is in resonance mode.
Establish the correct rotational direction,
(refer to (6)-2-b)
Disassemble the pump to remove the
foreign matter.
Modify the piping.
