Problem Possible Cause Remedy
Info-LED blinks once.
During the initial operation,
the pump did not suck water
for 30 seconds.
The pump sucks nothing up Pump was not sufficiently filled
with liquid to be pumped.
v Fill and secure the pump
so that water does not drain
out on the pressure side
during the suctioning
process (see 5. Operation).
Air cannot escape on the pres-
sure side, because the pressure
side outlets are closed.
v Open the pressure side
outlets (see 5. Operation).
Pump motor does not start Thermal circuit breaker
activated and the pump
housing is heated.
1. Change the switch to O.
2. Open possible existing
shut-off device in the pres-
sure line (release pressure).
3. Ensure sufficient ventilation
and allow the pump to cool
for approx. 20 min.
4. Restart the pump
(see 5. Operation).
Pump is blocked.
v Manually remove the
blockage (see “Free the
impeller”).
v Allow the pump to cool down
for 20 minutes.
Only Art. no. 1758:
Flow Sensor signal faulty.
Flow Sensor blocked.
v Clean Flow Sensor (see
“Cleaning the flow sensor”).
Info-LED blinks 2 times.
Pump has no suction within
6 minutes.
The pump sucks nothing up Problem on pump side.
v Immerse suction hose end
under water,
v eliminate any leak on the
suction side,
v clean check valve on the
suction line and check the
mounting direction,
v clean suction filter on the
suction hose end,
v clean filter lid seal and
screw lid until the stopper
(see 7. Maintenance),
v clean fine-mesh filter in the
pump.
Suction hose deformed.
v Use a new suction hose.
Pump motor does not start Thermal circuit breaker activated
(motor overheated).
v Allow the pump to cool
down for 20 minutes.
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