Cleaning the check valve:
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7. Troubleshooting
Problem
The pump sucks nothing up.
Pump motor does not start
or stops suddenly during
operation.
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1. Unplug the pump from the mains.
2. Turn the Pressure Tank Unit upside down.
3. Turn the rotary switch
4. If necessary close all the suction side inlets.
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5. Open all pressure side outlets, so that the pressure side is
depressurised.
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6. Unscrew the drain screw
1
7. Undo screw
2 into the bearing groove.
8. Using a suitable tool, unscrew the check valve cover
9. Remove the valve body
10. Reassemble the check valve in the reverse order.
11. Switch the Pressure Tank Unit back on again
(see 4. Operation).
DANGER ! Electric shock !
➔ Unplug the cable at the mains before trouble-shooting.
Probable cause
Rotary switch is not turned to
RUN.
The pump is sucking air through
a leak at a connection on the
suction side.
Pump is not adequately primed
with the liquid to be pumped.
Air cannot escape on the pres-
sure side, because the pressure
side outlets are closed.
End of the suction hose is not in
the water, the non-return valve
at the end of the suction hose is
missing or leaking, the suction
hose is kinked, connections are
leaking or the suction filter is
blocked.
Mains plug not plugged in.
Power failure.
Pump impeller is jammed.
Overheating due to running dry
or water temperature too high
(Thermal overload switch has
switched the pump off).
to FILL.
and drain the water.
and slide the clip
upwards 1 and to the rear
and wash it under running water.
Remedy
➔ Refill pump and turn rotary
switch to RUN.
➔ Check all connections and
make them air-tight as
necessary.
➔ Prime the pump
(see 4. Operation).
➔ Open the pressure side
outlets.
➔ Check the complete suction
hose from suction point
through to the pump for leak-
tightness and repair any
leaks as necessary.
➔ Insert mains plug into a
mains socket (230 V AC).
➔ Check fuse and cables.
➔ Turn the pump impeller motor
shaft with a screwdriver to
free it.
➔ Check the water level at the
suction side.
➔ The maximum temperature of
the liquid conveyed should
be (35 °C).
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