Insufficient Flow; Pump Runs At Maximum Speed And Cannot Be Controlled; Fault Indication On The Operating Panel - Grundfos UPM3S Series Data Booklet

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Remedy
• Remove impurities. Deblock the pump from the front of the control box with a screwdriver.
Cause
Pump is defective.
Remedy
• Replace the pump.

Insufficient flow

Cause
Pump performance is too low.
Remedy
• Check the external controller and the pump settings.
Cause
Hydraulic system is closed or system pressure is insufficient.
Remedy
• Check the non-return valve and filter. Increase the system pressure.

Pump runs at maximum speed and cannot be controlled

Cause
No signal from signal cable.
Remedy
• Check if the cable is connected to the controller. If it is, replace the cable.

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.
LED1 LED2
red green
●
●
●
See also https://www.youtube.com/watch?v=cMC02526Z_s.
58
Operating panel
LED3 LED4
yellow yellow
●
●
LED5
Indication
yellow
● 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
Control the supply
because of low supply
voltage.
voltage or serious
Replace the pump.
failure.
UPM3