Button Locking; Alarm Functions; Service Alarm - Grundfos CU 301 Instrucciones De Instalacion Y Operacion

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
Fig. 14 Button lock indication
When the buttons are locked, the indicator light is
permanently on. See fig. 14. See also section
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.

5.6 Service alarm

If one or more factory-set alarm values are
exceeded, the indicator light for service alarm is
permanently on. See fig. 15.
Fig. 15 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
PSI
100
90
80
70
60
50
40
Remote.
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