Instructions

en
LED displays
18 HW 4000-4500 FCS
Malfunction Cause Rectification
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 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
Switching condi-
tion
LED display Function description/actions
Normal operation mode
Pump switches on
and starts to draw
water. Pump fills
the tank with out-
let closed.
LED display PUMP ON lights up. LED
display FLOW CONTROL flashes.
Initial commissioning Pump filled
with water, suction and pressure side
connected, water present on the suc-
tion side. Pump connected to mains.
Pump runnig. LED display PUMP ON lights up. Pump delivering water. Water is being
drawn off on the pressure side.