Grundfos UPS User Manual

English (GB)
16
9.2 Twin-head pumps with relay module
Fault Cause Remedy
The pump does not run.
None of the indicator
lights are on.
One fuse in the installation is
blown.
Replace the fuse.
External mains switch switched
off.
Switch on the mains switch.
Current-/voltage-operated earth-
leakage circuit breaker has
tripped out.
Repair insulation defects, and cut in the circuit
breaker.
Missing phase (only three-phase
pumps).
Check fuses and connections.
The pump does not run.
The green indicator light
flashes.
The pump has been stopped by
the external on/off switch.
Switch on the external on/off switch.
The pump does not run.
The green indicator light
is on.
Rotor blocked, but the pump has
not been cut out by the thermal
overload switch.
Switch off the power supply, and clean or
repair the pump.
The pump does not run.
The red indicator light is
on.
The green indicator light
is off.
The pump has been cut out by
the thermal overload switch due
to high liquid temperature or
blocked rotor.
Check that the liquid temperature falls within
the specified range.
The pump will restart automatically when it has
cooled to normal temperature.
Note: If the thermal overload switch has cut
out the pump three times within a short period,
the pump must be restarted manually by
switching off the power supply.
The speed switch module has
not been fitted.
Switch off the power supply with the external
mains switch, and fit the speed switch module.
The pump does not run.
The green indicator light
flashes.
The red indicator light is
on.
The pump is or has been cut out
by the thermal overload switch
and the external on/off switch is
switched off.
Check that the liquid temperature falls within
the specified range.
Note: If the thermal overload switch has cut
out the pump three times within a short period,
the pump must be restarted manually by
switching off the power supply.
The pump has been stopped by
the external on/off switch.
The pump will be running with
wrong direction of rotation,
if started.
Switch off the power supply with the external
mains switch, and interchange two phases in
the terminal box.
The pump is running.
The red and green
indicator lights are on.
The pump is running with wrong
direction of rotation (only three-
phase pumps).
Noise in the system.
The green indicator light
is on.
Air in the system. Vent the system.
The pump flow is too high.
Reduce the pump performance
(change to lower speed).
The pressure is too high.
Reduce the pump performance
(change to lower speed).
Noise in the pump.
The green indicator light
is on.
Air in the pump. Vent the pump.
The inlet pressure is too low.
Increase the inlet pressure, and/or check the
air volume in the expansion tank, if installed.
Insufficient heat in some
places in the heating
system.
The pump performance is too
low.
Increase the pump performance
(change to higher speed),
if possible, or replace the pump with a pump
with a higher flow.

Grundfos UPS Specifications

General

Brand	Grundfos
Model	UPS
Category	Water Pump
Language	English