TROUBLESHOOTING
BOREHOLE PUMPS  
INCONVENIENT PROBABLE CAUSE REMEDY
THE MOTOR FAILS TO START  1. No electricity supply
2. Starter device is defective
3. The pump is stuck
4. The motor starter overload has tripped out
5. No water or too low water level in borehole		 1. Contact the electricity supply authorities
2. Repair or replace the starter device
3. Pull out the pump and clean
4. Reset the motor starter overload

5. Wait water level restoration, or increase the installation depth of the pump
THE PUMP DELIVERS ABSOLUTELY NO WATER 1. Stuck screen
2. Pump covered with sand
3. Clock check valve		 Pull out the pump and clean
AMPERAGE INCREASE 1. Pump covered with sand mechanical 2. friction
3. Wrong 3ph motor direction of rotation 		1. Pull out the pump and clean
2. Pull out the pump and replace
3. Wires line must be inverted
INSUFFICIENT CAPACITY AND HEAD 1. Stuck pump/screen
2. Leakage in the pipe work
3. Worn pump		 1. Pull out the pump and clean
2. Check and repair the pipe work
3. Pull out the pump and replace the worn parts

DRAINAGE PUMPS		  
INDUSTRIAL PUMPS
INCONVENIENT PROBABLE CAUSE REMEDY
FAILURE IN ELECTRIC PUMP 1. Lack of current to the motor

2. Insufficient voltage
3. Thermal protection activated
a) 1ph motor

b) 3ph motor
4. Defective non operating floating switch
5. 1ph motor: defective condenser

6. Motor failure
7. One phase interruption (3ph- motors)
8. One phase interruption (3ph- motors)
9. Clogged impeller		 1. Check electric network, supply cables, connectionsand fuses
2. Verify value (see par. 3 4.Use limits)
3.
a) Wait for motor cooling (see par. "electric connections")
b) Reset thermal relay and check rating starting.
4. Clean and check efficiency; (contact the Assistance Service if necessary)
5. Wait for level reset, check efficiency of level control relay and relevant electrodes
6. Check and eventually replace condenser
7. Contact the Assistance Service

8. Reset connections

9. Remove obstruction, wash and clean ( contact the Assistance Service if necessary)

ELECTRIC PUMP STARTING WITH THERMAL PROTECTION INTEREVENTION WINDING

 1.Voltage different from plate
2. 3ph- motor phase interruption
3. 3ph- motor: Low rating.
4. Short-circuit; earth leakage in electric cables or motor

5. Pumped liquid too dense

6. Dry running of the electric

7. Too high temperature of pumped liquid
8. Defective thermal relay		 1. Check the power supply voltage value
2. Reset connections
3. Adjust rating of relay value

4. Individuate interruption and repair (contact the Assistance Service if necessary)
5. Check whether the right type of pump has selected
6. Dilute liquid. Check whether the right type of has been selected
7. Verify liquid level and level pump

8. Replace it
ELECTRIC PUMP DRAWING MORE POWER THAN VALUE OF PLATE 1. Overload due to pump clogged

2. Pumped liquid too dense or viscious.
3. Overload due to obstruction

4. Damaged motor bearings
5. Wrong rotation direction
6. Insufficient pressure required
 1. Remove obstruction and clean (contact Assistance Service if necessary)
2. Dilute liquid. Check whether the right pump
been selected
3. Remove obstruction and clean of extraneous bodies
4. Replace. Contact the Assistance Service
5. Invert two of the three phases
6. Increase electric pump pressure by the reducing flow. Check whether the right pump has been selected
INSUFFICIENT PERFORMANCES 24 Suction, impeller, valve or delivery pipeline clogged
25. Weared pump or impeller
26. Air or gas in the pumped liquid		 24. Clean carefully

25. Replace or repair
26. Increase dimensions of pit or collecting tank and foresee degasing devices

IN@OUT
INCONVENIENT PROBABLE CAUSE REMEDY
PUMP DOES NOT SUPPLY WATER, MOTOR IST RUNNING 1. No electric power
2. Plug fitted incorrect
3. Tripped differential switch

4. Faulty condenser

5. Pump running without fluid Pump in alarm


6. Leak in the hydraulic installation; overheating of the motor and tripping of the motor thermal protection switch		 1-2. Check that the pump is connected to the power supply and insert the plug
3. Reset the switch. If the switch trips once more, contact a qualified electrician
4. Have the condenser replaced by qualified personnel
5. Reset the correct water level inside the pump body, check the level of the liquid to suck, and resume operation by reconnecting the pump to the power supply
6. Wait for the pump to cool down and reconnect it to the power supply
PUMP DOES NOT SUPPLY WATER, MOTOR IST RUNNING 1. Suction filter clogged.
2. Air inside the pump or the inlet pipe.

3. Pump improperly primed		 1. Clean the filter
2. Try restarting the pump several times by disconnecting and reconnecting it to the power supply in order to remove all the residual air
3. Reset the correct water level inside the pump body and check the level of the fluid that has to be sucked
PUMP SUPPLIES REDUCED FLOW RATE 1. Partially obstructed suction filter
2. Partially obstructed delivery pipe
3. Partial suction of air		 1. clean the filter
2. remove the obstructions
3. check the tightness of the seals on the hydraulic pipes

END-SUCTION PUMPS		  
INCONVENIENT PROBABLE CAUSE REMEDY
MOTOR DOES NOT START, NO NOISE OR VIBRATION 1. Voltage does not get to the motor cable
2. The fuses are burnt out
3. Motor cable broken 		1. Check appliance and/or electricity line

2. Replace the fuses with new one
3. Repair or replace the cable
MOTOR DOES NOT START, IT IS NOISY AND/OR VIBRATES 1. The motor has been connected wrongly
2. The capacitor is broken
3. The rotating member is jammed		 1. Correct any wrong connections

2. Replace the capacitor
3. Dismantle and remove the cause
PROTECTION DEVICES TRIP

1. The voltage is too high
2. A cable is earthed or short-circuited
3. The winding is earthed

4. Cable terminals loose
5. The rotating memeber is jammed
6. too much sand in the water

 1. Call the lectricity company
2.Repair or replace the cable
3. Dismantle the motor and remake the winding
4. Tighten all the teminals
5. Dismantle and overhaul
6. Reduce the rate of flow with the delivery gate valve.
INSUFFICIENT OR ZERO FLOWRATE 1. The pump has not been filled with water
2. The suction pipe is narrow or it is leaking
3. The foot valve is clogged
4. Impellers clogged
5. The level in the well drops more than expected		 1. Fill the pump

2. Replace the damaged pipe or gland

3. Clean or replace the valve
4. Dismantle and overhaul
5. Check the capacity of the well
LOWER HEAD THAN DECLARED 1. Wrong direction of rotation
2. Leakage in delivery pipe
3. Intemal members worn out
4. Air or gas in the water		 1. Change the direction of rotation
2. Replace the demaged pipe or gland
3. Dismantle and overhaul
4. Call the manufacturer

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