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english
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,
(no LED indication)
check supply voltage
Short-circuit Mains
supply
when switching on pump
wrongly connected
Connect correctly
Motor defective
Change pump
Power consumption
Fault in electronics
Restart pump
indicates fault « »
(switch mains supply ON/OFF)
(see section 5.1)
Mains voltage too low
Check control and mains
Noises from pump
Air in pump
Vent system several times
with pump switched off.
Pump vented automatically
see sections 6.1
Cavitation
Increase system pressure/
reduce temperature
see section 10
Pump too powerful
Set lower characteristic
see section 6.1/smaller pump
Radiators do not heat up
Pump too weak
Set higher characteristic,
see section 6.1
fit more powerful pump
Switch off automatic
night reduction
Aut.
Air in pump
Vent system with pump off
see section 7.2
Subject to technical modifications