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8. Fault finding chart
The pumped liquid may be scalding hot and under high pressure. Before any removal or dismantling
of the pump, the system must therefore be drained or the isolating valves on either side of the pump
must be closed.
Indicator light is off.
Indicator light is on.
Indicator light is flashing.
Indicator
lights
Fault Cause Remedy
Green Red
The pump is not
running.
One fuse in the installation is
blown/tripped out.
Replace/cut in the fuse.
Check that the electricity supply falls
within the specified range.
The current-operated or voltage-
operated circuit breaker has
tripped out.
Cut in the circuit breaker.
Check that the electricity supply falls
within the specified range.
The pump may be defective.
Replace the pump or call GRUND-
FOS SERVICE for assistance.
The pump is not
running.
The pump has been stopped in
one of the following ways:
1. With the button .
2. With the R100.
3. External on/off switch in posi-
tion off.
4. Via bus signal.
1. Start the pump by pressing .
2. Start the pump with the R100 or
by pressing .
3. Switch on the on/off switch.
4. Start the pump via bus signal.
The pump has
stopped due to
a fault.
Electricity supply failure.
Check that the electricity supply falls
within the specified range.
Pump blocked and/or impurities
in the pump.
Dismantle and clean the pump.
The pump may be defective.
Use the R100 for fault finding, see
section 7.5.3 Fault indications.
Replace the pump or call GRUND-
FOS SERVICE for assistance.
The pump is
running but is
faulty.
The pump is faulty, but is able to
operate.
Try to reset the fault indication by
briefly switching off the electricity
supply or by pressing the button ,
or .
Use the R100 for fault finding, see
section 7.5.3 Fault indications.
In case of repeated faults, contact
GRUNDFOS SERVICE.
The pump has
been set to stop
and is faulty.
The pump is faulty, but is able to
operate (has been set to STOP).
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