Fault Finding; Fault Finding Chart - Grundfos UP XL Instrucciones De Instalación Y Funcionamiento

7. Fault finding

7.1 Fault finding chart

Warning
Before removing the terminal box
cover, make sure that the electrical
supply has been switched off and that
it cannot be accidentally switched on.
Fault
1. The pump does not
run.
2. The pump does not
run.
3. Noise in the system. a)
4. Noise in the pump.
5. Insufficient heat in
some places in the
heating system.
Cause
a) External circuit breaker is
switched off.
b) Current-/voltage-operated
ground fault circuit
interrupter has tripped.
a) Rotor is blocked.
b) The speed switch is not
fully positioned (is
between speeds)
c) The pump has been cut
out by the thermal
overload switch due to
high liquid temperature.
Air in the system.
b) The pump flow is too
high.
c) The pressure is too high.
a) Air in the pump.
b) The inlet pressure is too
low.
a) The pump performance
is too low.
b) The performance is too
high.
Warning
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.
Remedy
Switch the circuit breaker on.
Repair the insulation defects and reset
the interrupter.
Switch off the electrical supply and
clean/repair the pump.
Switch off the electrical supply at the
external circuit breaker and change
speed switch into position.
Check that the liquid temperature falls
within the specified range. The pump will
restart automatically when it has cooled
to normal temperature.
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. Flow too fast through the
boiler/heat exchanger may not allow for
the proper BTU transfer to the fluid. If
fluid is too slow, fluid may be cooling too
much before returning from the system.
If changing speeds does not resolve the
problem, replacing the pump with a
properly sized pump may be required.
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