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7. TROUBLESHOOTING GUIDE
Problem
Possible cause
1
The pump fails to
No proper power is supplied (i.e. power outage, voltage
start or, starts but
drop, etc.)
stop immediately
Power cable is faulty or disconnected
Malfunction in control system (control panel).
Fuses blowed
Tripped circuit breaker
Tripped thermal protector
Leakage detector alarm
Tripped residual current device (RCD)
Damaged or wrongly connected ca- pacitor (single
phase motor)
Tripped level control
2
The power supply
Phase voltages too low or not balanced
circuit breaker trips
Wrong electrical connection
Overload relay is set too low or is faulty
Short circuit in the motor winding
Clogged hydraulic
Blocked rotor
3
The thermal protec-
The pump is immersed in a liquid which is too hot
tion trips after a short
Clogged hydraulic
operating time
Internal moving parts are damaged
Uncorrect voltage
Fault in bearings
Starts per hour exceed the permitted number
4
Tripped residual cur-
Humidity in motor.
rent device (RCD)
Low motor winding insulation
Fault in cable
5
The pump operates
Clogged hydraulic
but the flow is low
or null
Clogged outlet pipe
Blocked non-return valve
Outlet valve blocked or closed
Wrong direction of rotation
Leakage in the pipeline
Wrong pump selection
6
Starts per hour
Wrong setting of the level control
exceed the permitted
Level control malfunction
number
Turbolence near the level sensors
Undersized tank
Safety, Installation and Operations Manual - Original instructions
Solution
Contact a skilled electrician
Inspect the cable and check that the connections to
power line are properly tightened
Have the cause investigated and repaired by a skilled
electrician
Check fuses type and rating and replace them with
correct ones
Refer to Point 2
Refer to Point 3
Refer to Point 4
Refer to Point 5
Contact a skilled electrician to replace the capacitor
and check that it's correctly connected
Check that the level sensors are correctly connected
and functioning
Contact a skilled electrician
Contact a skilled electrician to check and correct the
electrical installation
Check the overload relay. Set the relay according with
the rated current on the dataplate
Contact an authorised service center
Clean the hydraulic parts and remove the blocking
material
Contact an authorised service center
Cool down the liquid
Clean the hydraulic parts and remove the blocking
material
Contact an authorised service center
Check that the supplied voltage matches with the one
on the pump's dataplate
Contact an authorised service center
Refer to Point 6
Contact an authorised service center
Contact an authorised service center
Have the cable checked and repaired by a qualified
electrician
Clean the hydraulic parts and remove the blocking
material
Clean the outlet pipe
Clean the non-return valve
Open and/or clean the outlet valve
Check the direction of rotation, interchange any two of
the phases
Check the pipeline and fix the leakage causes
Replace the pump with a suitable one
Correct the level control setting
check the level sensors functionality
Remove the causes of turbulence or change the posi-
tioning of the level sensors
Adjust the tank dimension
EN
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