Grundfos UPM3 User Manual

11. Fault finding
11.1 Noise in the pump
Cause Remedy
There is air in the pump. • Let the pump run. The pump vents itself over time.
Inlet pressure is too low. • Increase the system pressure or check the air volume in the
expansion tank, if installed.
11.2 Noise in the system
Cause Remedy
There is air in the system. • Vent the system.
Differential pressure is too high. • Reduce the pump performance at the pump or external controller.
11.3 Pump is not running, no power supply
Cause Remedy
System is switched off. • Check the system controller.
A fuse in the installation is blown. • Replace the fuse.
Power supply failure. • Check the power supply.
11.4 Pump is not running, normal power supply
Cause Remedy
Controller is switched off. • Check the controller and its settings.
Pump is blocked by impurities. • Remove impurities. Deblock the pump from the front of the control
box with a screwdriver.
Pump is defective. • Replace the pump.
11.5 Insufficient flow
Cause Remedy
Pump performance is too low. • Check the external controller and the pump settings.
Hydraulic system is closed or system pressure is insufficient. • Check the non-return valve and filter. Increase the system
pressure.
11.6 Pump runs at maximum speed and cannot be controlled
Cause Remedy
No signal from signal cable. • Check if the cable is connected to the controller. If it is, replace the
cable.
11.7 Fault indication on the operating panel
When an alarm is active, the LEDs indicate the alarm type as defined in the table below.
If multiple alarms are active at the same time, the LEDs only show the error with the highest priority. The priority is defined by the sequence of
the table.
Operating panel
LED1
red
LED2
green
LED3
yellow
LED4
yellow
LED5
yellow
Indication Pump operation Counter action
● ● Rotor is blocked.
Trying to start again
every 1.33 seconds.
Wait or deblock the
shaft.
● ●
Supply voltage too
low.
Only warning, pump
runs.
Control the supply
voltage.
● ● Electrical error.
Pump is stopped be-
cause of low supply
voltage or serious fail-
ure.
Control the supply
voltage.
Replace the pump.
Related information
5.2.1 Reduced supply voltage
7.2.2 Alarm status
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English (GB)

Grundfos UPM3 Specifications

General

Brand	Grundfos
Model	UPM3
Category	Water Pump
Language	English