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9. Fault summary and checklist
Warning
Before starting to rectify faults, it is vital that the
pump is taken out of operation, and it must be re-
moved from the mains at all poles and safe guarded
from being switched on again. This should only be
carried out by specialist staff.
Accessible voltage!
Risk of scalding from escaping medium.
Risk of burning from hot surfaces.
The list below should be followed step by step from top to bottom.
Fault Cause Remedy
Pump does not run
(no LED indication)
No motor voltage
Check switch and fuses, check supply voltage
Short-circuit
when switching on pump
Mains supply wrongly connected Connect correctly
Motor defective Change pump
Power consumption
indicates fault «– –»
Fault in electronics Restart pump (switch mains supply ON/
OFF)
Mains voltage too low Check control and mains
Motor blocked Switch pump ON/OFF several times.
Disassemble motor for de-blocking:
– Close slide valve before and after pump
– Dismantle motor; release
4 socket-head screws.
Warning:
hot water can run out.
– Remove motor
– Turn impeller until shaft turns easily.
– Fit motor and open slide valve.
Noises from pump Air in pump Vent system several times with pump swit-
ched off. Pump vented automatically
Cavitation
Increase system pressure/reduce temperature
Pump too powerful
Set lower characteristic
Radiators do not heat up Pump too weak
Set higher characteristic
t more powerful pump
Switch off automatic night reduction
Aut.
Air in pump Vent system with pump off
Subject to technical modications.
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