Fault Finding Chart - Lowara 107261010 Instructions Pour L'installation Et L'emploi

8. Troubleshooting
If the malfunction is not included in the chart below or is marked by an asterisk, please contact a service
centre near you.
PROBLEM PROBABLE CAUSE
PUMP DELIVERS No power supply
NO WATER, Overload protection
MOTOR DOES tripped
NOT START Tripping of automatic switch or
differential switch
Impeller jammed
Faulty capacitor
Minimum pressure setting
too low
PUMP DELIVERS Water level too low and foot
NO WATER, valve out of water
MOTOR STARTS
Pump not full with liquid or leaks
Non-return valve clogged
PUMP GIVES Suction lift exceeds pump lift
INSUFFICIENT capacity on friction losses
WATER OR too high on suction side
PRESSURE
Pump or pipes clogged
Impeller or volute worn
Poor voltage supply
Air inside suction piping
Wrong pressure switch setting
Incorret pump choice
PUMP STARTS Tank air-preloading insufficient
TOO FREQUENTLY or excessive
Diaphragm broken in the tank
Wrong pressure switch setting
Water leaks through non return
valve or pipes
PUMP DOES Maximum pressure setting
NOT STOP too high
NOISY Suction lift too high
OPERATION
Pump runs beyond rated delivery
Worn bearings
WATER LEAKS Mechanical seal worn or
BETWEEN PUMP damaged
SUPPORT
AND MOTOR
NOTES
Automatic resetting after
cooling (single-phase model)
Reset the switch. If it trips again
call a qualified electrician
Foreign bodies block the
impeller
Replace the capacitor.
Reset the pressure switch
Attention: mechanical seal or
impeller could be
damaged
Same as above
Reduce suction lift.
Replace suction pipe with one
of larger diameter.
Reduce elbows.
Remove deposits.
Clean or unclog
Reset the pressure switch
Check pre-loading pressure
Reset the pressure switch
Reset the pressure switch
en
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