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6. Troubleshooting
6.1 Fault finding chart
Warning
Before removing the terminal box cover, make sure that the power supply has been
switched off and that it cannot be accidentally switched on.
The pumped liquid may be scalding hot and under high pressure. Before any removal
or dismantling of the pump, the system must be drained or the isolation valves on
both sides of the pump must be closed.
Fault Cause Remedy
1. The pump does
not run.
a) One fuse in the installation
is blown.
Replace the fuse.
b) External circuit breaker is
switched off.
Switch the circuit breaker on.
c) Current-/voltage-operated
ground fault interrupter
has tripped.
Repair the insulation defects and reset
the interrupter.
d) The pump has been cut
out by the thermal
overload switch due to
high liquid temperature or
blocked rotor.
Check that the liquid temperature falls
within the specified range. The pump will
restart automatically when it has cooled
to normal temperature.
e) Rotor blocked, but the
pump hasn't been cut out
by the thermal overload
switch.
Switch off the electrical supply and
clean/repair the pump.
2. Noise in the
system.
a) Air in the system. Vent the system.
b) The pump flow is too high. Reduce the pump performance.
c) The pressure is too high. Reduce the pump performance.
3. Noise in the pump. a) Air in the pump. Vent the pump.
b) The inlet pressure is too
low.
Increase the inlet pressure and/or check
the air volume in the expansion tank
(if installed).
4. Insufficient heat in
some places in the
heating system.
a) The pump performance is
too low.
Increase the pump performance,
if possible, or replace the pump with a
pump with higher flow.
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