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