17
(
Q
J
OLV
K
8
6
10. Troubleshooting
Warning
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 the fuse.
Check that the electricity supply
falls within the specified range.
The current-operated or volt-
age-operated circuit breaker has
tripped out.
Reset circuit breaker to ON
position.
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 9.5.3 Fault indica-
tions.
Replace the pump or call Grund-
fos Service for assistance.
The pump is
running but
has a fault.
The pump has a fault, 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 9.5.3 Fault indica-
tions.
In case of repeated faults,
contact Grundfos Service.
The pump
has been set
to stop and
has a fault.
The pump has a fault, but is able
to operate (has been set to
STOP).
