144
Fault Cause Remedy
None of the pumps are
running.
None of the indicator
lights are on.
One fuse in the installation is blown. Replace the fuse.
The current-operated or voltage-operated
circuit breaker has tripped out.
Cut in the circuit breaker.
The pump is defective. Repair or replace the pump.
The pump is not running.
The green indicator light
is flashing.
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 position 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 fault can be temporarily corrected by selecting max. curve duty on the
pump or with the R100, as external forced-control signals will be ignored.
Both pumps have stopped
due to a fault.
The red indicator light is
on and the green indica-
tor light is off.
Electricity supply failure (e.g. undervolt-
age).
Check that the electricity supply falls
within the specified range.
Missing phase (the pump runs for 2 min-
utes and then stops).
Check fuse and connections.
The pumps are blocked and/or impurities
in the pumps.
Remove the inspection screw and
turn the rotor by means of a screw-
driver inserted into the slot in the
shaft end, and/or dismantle and
clean the pump.
Fault in electronics. Contact Grundfos.
The pump is running, but
has been stopped due to
a fault.
The red and green indica-
tor lights are on.
The differential pressure and temperature
sensor is defective.
Check sensor connection. Replace,
if necessary.
The master and slave pumps have been
stopped due to a fault. One or both
pumps have restarted automatically.
Reset fault indication.
The master pump is or has been stopped
due to a fault.
The slave pump is or has been stopped
due to a fault.
The pump has been set to
stop, but has been
stopped due to a fault.
The red indicator light is on
and the green indicator
light is flashing.
The differential pressure and temperature
sensor is defective.
Check sensor connection.
Replace, if necessary.
The master and slave pumps have been
stopped due to a fault.
Reset fault indication.
The master pump is or has been stopped
due to a fault.
The slave pump is or has been stopped
due to a fault.
Noise in the system.
The green indicator light
is on.
Air in the system. Vent the system.
The flow is too high. Reduce the head (setpoint) and pos-
sibly change over to constant pres-
sure.
The pressure is too high. Reduce the head (setpoint) and pos-
sibly change over to proportional
pressure.
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