12. DEPANNAGE
Check the pump after power cut-off.
Symptom
Cause
Corrective Action
The motor can not
be started
Single-phase power supply
(three-phase electric motor):
a) poor connection of the power
switch;
b) fuse is burned out;
c) loose power lead;
d) phase failure of the cable
a) repair switch contact or replace the
switch;
b) replace the safety fuse;
c) check and tighten the power
connector;
d) repair or replace cables.
Capacitor is burned out.
Replace with a same type capacitor
(send to the maintenance point for
repair).
The rotating shaft and bearing are
jammed.
Replace the bearing (send to the
maintenance point for repair).
Impeller is jammed.
Turn rotating shaft of the fan blade
terminal with screw driver to let it rotate
flexibly or demount the pump body to
clear sundries.
Stator winding is damaged.
Replace winding coils (send to the
maintenance point for repair).
Pipe pressure above the setting
pressure of pressure switch
(automatic pump).
Increase power cut-off pressure of the
pressure switch, namely, rotate the
variable screw nut in “+” direction one
or two round, or change with more
suitable product.
The motor is in
operation, but no
water is
discharged
Incorrect direction of pump rotation.
Invert two-phase wirings of the motor
(three-phase motor).
The pump is not fully filled with water. Re-fill the pump with water.
The impeller is damaged.
Replace the impeller (send to the
maintenance point for repair).
Leakage of the suction pipe.
Check sealing of various joints of the
inlet pipelines.
Water level is too low.
Adjust installation height of the pump.
Freeze caused by accumulated water
in the pipeline or the chamber.
Start up the pump after ice is melted.
