User Manual

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LED displays
18 HWA 4000 / 4500 FCS
Malfunction Cause Rectification
Impeller blocked Cleaning the pump.
Release the motor shaft of the impeller
with a screwdriver.
Overheating by running dry or water
which is too hot (thermal protection
switch has switched the pump off).
Check the water level on the suction
side. Allow the conveying fluid to cool
down. Repair the pump or replace it.
Pump motor does
not run
No mains voltage Check fuses and power supply.
The suction line is not in the water. Submerge the end of the suction line
into the water by min. 30 cm.
Suction line blockage Remove dirt from the suction area.
Pressure line blocked off Open the closing off devices in the
pressure line.
Pump drawing air into the suction line Check all the connections in the suc-
tion line for leaks.
Replace seal ring.
Pump not drawing
water
Pump has been running dry. Fill the pump housing with water.
Diaphragm is damaged. Have the diaphragm replaced by AL-
KO Service Department.
Low air pressure in the storage vessel Top up the air in the storage vessel.
(Set the diaphragm pressure to 1.5
bar).
Pump switches on
and off frequently.
Pump drawing air, water shortage on
suction side.
Switch pump off and allow to cool.
Suction line blockage Clean the suction area.
Replace the filter.
Suction head too great Reduce the suction head.
Hose diameter too small Replace the pressure hose with one
with a larger diameter.
Flow rate too low
Water volume on the suction side to
little
Throttle back the pump to adapt the
flow rate.
ADVICE
If the faults cannot be rectified, please contact our Customer Service Department.
LED DISPLAYS
RESET