CAUSE & REMEDY CHART (In case of any problem, please check the underlined instructions).
1. PUMP DOES NOT WORK
S. No. CAUSES HOW TO CHECK REMEDIES
1
2
3
4
5
6
7
No power in main control panel/capacitor box.
Defective capacitor box/starter or incorrect
wir ing.
Faulty pressure switch & other control
devices for defects.
Pump has been stored unfavorable condition
for a long time before installation or defective
submersible motor or cable
Defective capacitor (for single phase
pumpset).
Pump choked.
Rotor seized due to prolonged shut down of
pumpset.
Check for blown out fuses in main.
Check for tripped circuit breakers.
Check the wiring, connection, voltage, relay
and coil size of the starter.
Check pressure switch & other control
devices for defects.
Switch off the main power line, de-link
pump power leads from capacitor box/
starter. Check the motor winding insulation
resistance with the help of a megger to see
whether the insulation resistance reading is
atleast 20m. ohm and check for defective
cable.
Switch off the main power line. Discharge
the capacitor and check the condition.
Remove the pump from the well. Ensure
whether the pump rotates freely and the
pump is free from excessive sand, silt &
mud.
Remove the pump from the well ensure that
the motor shaft rotates freely.
Replace blownout f uses. If new fuse also
blows out recheck all electrical wiring and
earthing. Check fuse wire size against actual
requirement.
Check the wiring to capacitor box/starter. If
the circuit breakers trips again, recheck all
electrical wiring including earthig.
Rectify or replace defective parts of capacitor
box/starter. Reconnect the capacitor box/
starter correctly. Change the relay and coil
size of the capacitor box/starter for actual
requirement.
Repair or replace faulty pressure switch or
control devices.
When megger reading shows less than 20m.
ohm remove the pumpset and cable and
recheck values on the ground. Repair or
replace motor and/or cable.
Replace the capacitor if required.
If the pump portion is damaged, repair or
replace theparts. Incase of repairing, make
sure that the pump is rinsed with water before
installation.
Repair or replace the rotor.
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S. No. CAUSES HOW TO CHECK REMEDIES
3. PUMP DELIVERS INSUFFICIENT WATER OR VERY LOW TOTAL HEAD
S. No. CAUSES HOW TO CHECK REMEDIES
1
2
3
4
5
6
7
Gate valve/check valve fitted in the riser pipe
defective/cl osed.
Low water level.
Water inlet strainer of the pump is clogged.
Defective pump.
Pumping system total is higher than the pump
head capacity.
Low voltage or low frequenc y of supply
resulting lesser speed.
Defective capacitor (for single phase
pumpset).
Inspect the gate valve/check valve.
Check draw down level. Ensure that the
pump is submerged in by atleast 2 feet
below th e draw down water level.
Remove pump from the well and inspect.
Remove the pump from the well ensure that
the pump rotates freely and the pump is
free from excessive sand, silt and mud.
Check the selection of the pumping system.
Check the voltage at starter / capacitor box
when pump operates. Check power cable
size and drop cable size.
Switch off the main power line. Discharge
the capacitor and check the condition.
If closed open the gate valve / check valve. If
defective, rectify or replace it.
If possible lower the pumpset. When the yeild
of the well not matches with the pumps
discharge. Fit one gate valve in delivery pipe
and throttle according to the yeild. Install the
dry run preventor.
Clean the strainer, if the strainer is damaged,
replace it.
When the pump portion is damaged, repair or
replace the parts. In case of repairing, make
sure that pump is rinsed with water before
reinstallation.
Select and change the pumpset suitable for
the system head.
When cable size are found inadiquate change
cable and replace to adequate size.
Replace the capacitor if required.
1
2
3
4
Well water yeild reduced.
Leak in riser pipe and / or surface pipe and /
or valves.
Water inlet strainer to the pump partially
blocked
Worn out impeller, bushes, thrust assembly.
Check draw down water level. Ensure that
the pump ia always submerged in water
during operation.
Check for leakage.
Remove the pump and inspect.
Remove the pump from the well, ensure
that the water is free f rom excessive s and
silt and mud.
If possible lower the pumpset, adjust the gate
valve of the riser pipe to match the yeild of the
borewell install dry run preventor.
Remove the leakages.
Clean the strainer, if damaged replace it.
Repair or replace pump parts.
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