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After successful maintenance and repair work, install and
connect the pump according to the "Installation and electri-
cal connection" chapter. Switch on the pump according to
the "Commissioning" chapter.
Fault
Pump is not run-
ning although the
power supply is
switched on.
Pump is making
noises.
Building does not
get warm.
26
Cause
Electrical fuse defec-
tive.
Pump has no voltage.
Cavitation due to
insufficient suction
pressure.
Thermal output of the
heating surfaces is
too low.
Remedy
Check fuses.
Restore power after
interruption.
Increase the system
suction pressure within
the permissible range.
Check the delivery-head
setting and set it to a
lower height if neces-
sary.
Increase setpoint
(see 5.3).
Set control mode to three
speed stages
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