Xylem Sphere and Block Units - Manual (Page 13)

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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 NOTES
PUMP DELIVERS No power supply
NO WATER, Overload protection Automatic resetting after
MOTOR DOES tripped cooling (single-phase model)
NOT START Tripping of automatic switch or Reset the switch. If it trips again
differential switch call a qualified electrician
Impeller jammed Foreign bodies block the
impeller
Faulty capacitor Replace the capacitor.
Minimum pressure setting Reset the pressure switch
too low
PUMP DELIVERS Water level too low and foot Attention: mechanical seal or
NO WATER, valve out of water impeller could be
MOTOR STARTS damaged
Pump not full with liquid or leaks Same as above
Non-return valve clogged
PUMP GIVES Suction lift exceeds pump lift Reduce suction lift.
INSUFFICIENT capacity on friction losses Replace suction pipe with one
WATER OR too high on suction side of larger diameter.
PRESSURE Reduce elbows.
Remove deposits.
Pump or pipes clogged Clean or unclog
Impeller or volute worn
Poor voltage supply
Air inside suction piping
Wrong pressure switch setting
Reset the pressure switch
Incorret pump choice
PUMP STARTS Tank air-preloading insufficient Check pre-loading pressure
TOO FREQUENTLY or excessive
Diaphragm broken in the tank
Wrong pressure switch setting
Reset the pressure switch
Water leaks through non return
valve or pipes
PUMP DOES Maximum pressure setting Reset the pressure switch
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
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