Button Locking; Alarm Functions; Service Alarm - Grundfos CU 301 Mode D'emploi

Arrow-up button
When this button is pressed, the system pressure
setting is increased in increments of 10 psi.
Arrow-down button
When this button is pressed, the system pressure
setting is decreased in increments of 10 psi.

5.4 Button locking

The buttons on CU 301 can be locked or unlocked
by pressing the two arrow buttons simultaneously
and holding them for 5 seconds or by using
Grundfos GO Remote.
When the arrow buttons are used for locking, the
pressure setting may change.
Use the following procedure:
1. Increase the pressure one step up.
2. Press the arrow-down button as the first one
when pressing the two buttons.
PSI
100
90
80
70
60
50
40
Button lock indication
When the buttons are locked, the indicator light is
permanently on. See fig.
See also section 6.3.10 Buttons on
Related information
6.3.10 Buttons on product

5.5 Alarm functions

CU 301 continuously receives operating data from
the pump. The alarm functions indicated on the
CU 301 front are described in the following
sections.
Button lock indication.
product.

5.6 Service alarm

If one or more factory-set alarm values are
exceeded, the indicator light for service alarm is
permanently on.
Service alarm indicator
Possible alarms
• Sensor defective
• Overload
• Overtemperature
• Speed reduction
• Voltage alarm
• No contact to pump.
The possible alarms, how to identify them and
make the relevant corrections is described in
section 8.1 Troubleshooting with Grundfos GO
Remote.
Related information
8.1 Troubleshooting with Grundfos GO Remote
PSI
100
90
80
70
60
50
40
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