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9. Summary of malfunctions
Switch off all poles of the supply voltage without fail
before removing the terminal box cover and always
before dismantling the pump.
The electronics can still be live for up to 10 minutes
after switching off the power supply!
Fault Cause Remedy
Pump does not run No motor voltage Check switch and fuses,
check supply voltage
Mains voltage too low Check control and mains
Pump blocked Deblock, see
Short-circuit Electronics wrongly
when switching on pump connected Connect correctly
Motor defective Change pump
lights Fault in electronics Exchange electronics,
possibly check external drive (Ext.)!
Check whether auxiliary module
fitted!
flashing 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 switched off.
see sections 6.2
Cavitation Increase system pressure/
reduce temperature
see section 11
Pump too powerful Set lower characteristic
see section 7.2
Radiators do not heat up Pump too weak Set higher characteristic,
see section 7.2
fit more powerful pump
Air in pump Vent system with pump off
see section 6.2
Subject to technical modifications
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