Ins
ta
lla
tio
n a
nd o
pe
ra
tio
n i
ns
tru
ct
io
ns
7. Troubleshooting
Fault
Cause
Remedy
Difficulty at starting
1. Low voltage
2. Default phase of the electric pump or breakage
of the cable
3. Stuck impeller
4. Too much voltage reduction of the cable
5. Capacitor damage
6. Burned-out stator winding
1. Ask the electric power company to solve or add the voltage;
regulator and adjust the voltage to 0.9–1.1 times of the rated value
2. Check the switch wiring terminal and the cable
3. Use the screwdriver to toggle the rotation shaft at the fan end to
make it rotate flexibly or disassemble the pump body to clear the
debris
4. Thicken the cable properly
5. Send it to the maintenance center to replace the capacitor with
one with the same capacitance
6. Send it to the maintenance center to replace the winding coil
Insufficient flow or
pressure
1. Wrong pump selection
2. Overlong inlet pipeline, over-high head or
serious bending of the pipeline
3. Insufficient water source
4. There are foreign matters blocking the inlet
pipeline, filter screen or foot valve
5. Serious wearing of the impeller
1. Select correct pump
2. Shorten the pipeline, use it within the head application range or
make pipeline bend gently
3. Check the water source
4. Wash and clean the pipeline, filter screen or bottom valve and
clear the blocking debris
5. Replace the impeller
The motor operates
but the pump has no
water flow
1. There is air leakage at the water inlet pipeline
2. There is air retained in the pump cavity
3. Air enters in through the sealing elements
4. The water level of the well is too low
5. The foot valve is not opened or seriously
blocked; the pipeline resistance is great; the
suction height is too high
1. Check whether the water inlet pipelines and joints are sealed
well and confirm that the seal is reliable
2. Refill water into the pump body and discharge the air
3. Adjust or replace the sealing elements with new ones
4. Adjust the installation height of the water pump
5. Check the flexibility of the foot valve, remove the stopper, try to
shorten the water inlet pipeline and reduce the suction height
The motor does not
work
1. The protector is disconnected or the fuse is
burned out
2. The impeller is stuck
3. The stator winding is burned out
4. The voltage is too low
5. The cable is broken
1. Check whether the using head or supply voltage meet the
specifications. The motor does not work when it is overheated, if
it does not work when it is cooled down, please contact the local
retailer
2. Clear the debris
3. Reinsert and rewind the coils and conduct an overhaul
4. Ask the electric power company to solve or add the voltage
regulator
5. Replace the cable
The stator winding
is burned out
1. The supply voltage is too low
2. Water enters in the motor, which causes short
circuit of the coil
3. The impeller is stuck
4. The electric pump is started too frequently
5. Over-load operation of the electric pump
6. Default phase of the three-phase electric pump
Clear the trouble, disassemble the winding, reinsert and rewind
the coil as per the original technical requirements and soak and
dry the insulation varnish or send it to the maintenance unit for
repair
Fault
Cause
Remedy
The electric pump
cannot be halted
when water is not
used
1. The water level is lower than the pump suction
2. The pressure of the water outlet pipeline is
lower than the switch stop pressure and cannot
ensure the switch is completely cut off
3. The water pump is used to pump circulating
water
4. There is no valve at the water outlet pipeline
of the electric pump and the water is directly
pumped into the water tank
1. Reduce the installation height of the pump
2. Ask the profession personnel to properly turn down the switch
pressure value, first cut off the power, remove the pressure switch
cover and use the screwdriver to slowly turn it in the “-“ direction
to an appropriate position
3. Manually control the power switch
4. Install a valve on the water outlet pipeline or equip a float switch
in the water tank
Common faults of APS-A and APS-C automatic self-priming pumps and elimination methods
Before performing any troubleshooting, make sure the pump has been turned off and all moving components have
stopped rotating. Make sure that the pump cannot be turned on accidentally.
11
