Biral MX 12 Instructions D'installation Et D'entretien page 43

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Fault
Pump does not run
Short circuit
when pump switched
Pump emits noises
Radiators do not
warm up
english
7. Maintenance, Service
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.
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.
Cause
Pump blocked
No voltage in motor
Voltage too low
Motor incorrectly connected
Motor defective
Air in the pump
Cavitation
Pump too powerful
Power setting
Pump too weak
Air in the pump
Subject to technical alterations
Remedy
deblock,
see section 6.4
check switch and fuses
check power supply
check control and mains
connect correctly
replace pump
deaerate system and 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