Fault Finding; Noise In The Pump; Noise In The System; Pump Is Not Running, No Power Supply - Grundfos UPM3 Installation And Operating Instructions Manual

11. Fault finding

11.1 Noise in the pump

Cause
There is air in the pump.
Inlet pressure is too low.

11.2 Noise in the system

Cause
There is air in the system.
Differential pressure is too high.

11.3 Pump is not running, no power supply

Cause
System is switched off.
A fuse in the installation is blown.
Power supply failure.

11.4 Pump is not running, normal power supply

Cause
Controller is switched off.
Pump is blocked by impurities.
Pump is defective.

11.5 Insufficient flow

Cause
Pump performance is too low.
Hydraulic system is closed or system pressure is insufficient.

11.6 Pump runs at maximum speed and cannot be controlled

Cause
No signal from signal 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 LED2
red green
●
●
●
Related information
5.2.1 Reduced supply voltage
7.2.2 Alarm status
LED3 LED4
yellow yellow yellow
●
●
Remedy
• Let the pump run. The pump vents itself over time.
• Increase the system pressure or check the air volume in the
expansion tank, if installed.
Remedy
• Vent the system.
• Reduce the pump performance at the pump or external controller.
Remedy
• Check the system controller.
• Replace the fuse.
• Check the power supply.
Remedy
• Check the controller and its settings.
• Remove impurities. Deblock the pump from the front of the control
box with a screwdriver.
• Replace the pump.
Remedy
• Check the external controller and the pump settings.
• Check the non-return valve and filter. Increase the system
pressure.
Remedy
• Check if the cable is connected to the controller. If it is, replace the
cable.
LED5
Indication
● Rotor is blocked.
Supply voltage too
low.
Electrical error.
Pump operation Counter action
Trying to start again Wait or deblock the
every 1.33 seconds. shaft.
Only warning, pump Control the supply
runs. voltage.
Pump is stopped be-
Control the supply
cause of low supply
voltage.
voltage or serious fail-
Replace the pump.
ure.
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