8. TROUBLESHOOTING
Problems
Probable causes Corrective actions
The Pump fails to
start
No Power Check Voltage
Pump shaft blocked.
Use a screwdriver to turn the motor fan bolt
slightly
No Intake
Intake valve not in water Immerse intake valve in water
Pump head not filled with water Fill with water
Air in intake line Ensure intake line is well sealed
Intake valve leaks Clean or replace intake valve
Intake cage blocked Clean intake cage
Max. suction height exceeded Check suction height
Inadequate delivery
rate
Suction height too high Check suction height
Integrated filter dirty Clean filter
Water level falling rapidly
Immerse intake valve deeper and make sure
intake line is airtight
The pump stops
during operation
(Thermostat
switched pump off)
A solid body is blocking the impeller.
Connect discharge line to water line, disconnect
suction hose, open water line. Switch on pump
several times for approx. 2 sec. (Pre-filter strongly
recommended to prevent this problem).
Water is too hot. Ensure water temperature does not exceed 35°C.
Pump running dry.
Check intake line with water supply. Wait for
pump cool down then switch on again.
The pump switches
on and off frequently
The membrane inside of tank has
been pierced
Change membrane or the tank.
The pressure inside tank is incorrect. Re-inflate the tank to a pressure of 1.8 Bar.
The intake valve is blocked and leaks. Clean or replace intake valve.
The pump does not
stop.
Pressure switch problem.
Change the pressure switch, or have it adjusted by
a qualified specialist.
DANGER! Risk of injury due to electric shock.
Warning! Before any trouble shooting, switch off the pump and
remove the plug from the socket.
129
EN
20151214 SPECIFICATIONS 1300 WT 50 SM5I-3.indd 129 14/12/15 12:19
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