english
43
Before commencing maintenance works, do not fail
to put the pump out of action, pull all pins out of
the power supply and secure it against becoming
switched on again. Implementation only by specialist
staff.
Observe operating instructions.
Only carry out the works with the plant at a standstill.
Disconnect pump from power supply.
Switch off fuse and mount warning board.
Risk of scalding from emerging medium.
Risk of burning from hot surfaces.
7. Maintenance, Service
8. Summary of faults
Before removing the terminal box cover and before
any dismantling of the pump, do not fail to switch
off the entire power supply.
Fault
Cause
Remedy
Pump does not run
Pump blocked
deblock,
see section 6.4
No voltage in motor
check switch and fuses
check power supply
Voltage too low
check control and mains
Motor incorrectly connected
connect correctly
Motor defective
replace pump
Air in the pump
deaerate system and pump,
see section 6.2
Cavitation
increase system pressure/
reduce temperature
Pump too powerful
smaller electric setting/
smaller pump
Power setting
Check power setting
of pump
Pump too weak
install more powerful pump
Air in the pump
deaerate system and pump,
see section 6.2
Subject to technical alterations
Short circuit
when pump switched
Pump emits noises
Radiators do not
warm up
