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6 Maintenance/faults
DANGER: Before starting any maintenance and
repair work, disconnect the pump from the power
supply and make sure it cannot be switched back
on by unauthorised persons.
• Damage to the connection cable must always be
repaired by a qualified electrician.
• Faults must only be remedied by qualified personnel!
WARNING: Risk of burns when touching the pump!
Depending on the pump or the system operating
conditions (fluid temperature), the entire pump can
become very hot.
When removing the motor head or pump, hot fluid may
be expelled under high pressure.
• Allow the pump to cool down first.
• Close the stop valves before removing the pump.
There is always a strong magnetic field inside the motor.
The permanent magnet rotor installed in the pump can
pose mortal danger to people with medical implants
(e.g. pacemakers) during dismantling.
• Never open the motor and never remove the rotor.
Fault
Pump is not
running although
the power supply
is switched on
Pump is noisy
Building does not
warm up
42
Cause
Electrical fuse
defective
No voltage supply to
the pump
Cavitation due to
insufficient suction
pressure
Thermal output of the
heating surfaces is
too low
Remedy
Check fuses
Resolve the interruption to
the power supply
Increase the system supply
pressure within the
permissible range
Check the delivery head
setting and set it to a lower
height if necessary
Increase setpoint
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