Troubleshooting; Fault Finding Chart - Grundfos UP 200 Serie Instrucciones De Instalacion Y Operacion

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
1. The pump does
not run.
2. Noise in the
system.
3. Noise in the pump. a)
4. Insufficient heat in
some places in the
heating system.
10
Cause
a) One fuse in the installation
is blown.
b) External circuit breaker is
switched off.
c) Current-/voltage-operated
ground fault interrupter
has tripped.
d) The pump has been cut
out by the thermal
overload switch due to
high liquid temperature or
blocked rotor.
e) Rotor blocked, but the
pump hasn't been cut out
by the thermal overload
switch.
a) Air in the system.
b) The pump flow is too high.
c) The pressure is too high.
Air in the pump.
b) The inlet pressure is too
low.
a) The pump performance is
too low.
Remedy
Replace the fuse.
Switch the circuit breaker on.
Repair the insulation defects and reset
the interrupter.
Check that the liquid temperature falls
within the specified range. The pump will
restart automatically when it has cooled
to normal temperature.
Switch off the electrical supply and
clean/repair the pump.
Vent the system.
Reduce the pump performance.
Reduce the pump performance.
Vent the pump.
Increase the inlet pressure and/or check
the air volume in the expansion tank
(if installed).
Increase the pump performance,
if possible, or replace the pump with a
pump with higher flow.