Warning And Alarm Codes - Grundfos CU 321 Installation And Operating Instructions

5.4 Warning and alarm codes

Code Description
2 Sensor fault (sensor input below 4 mA)
4 AC line phase fault (only on 5 hp drive!)
5 Voltage warning high
6 Voltage warning low
7 Overvoltage
8 Undervoltage
9 Overload
12 Current limit
13 Overcurrent
14 Ground fault
15 Internal fault
16 Short-circuit
35 Inrush fault
36 Overtemperature
37-45 Internal fault
79 Dry run
Warning
The CU 321 will continue to operate for some time
depending on the alarm. The yellow warning indica-
tor light on the CU 321 flashes, and the specific code
appears in the display. See the specific codes about
the performance during warning.
Alarm with reset
The CU 321 will stop operating. The red indicator
light on the CU 321 lights up and the CU 321 will not
start until it is reset. The CU 321 will try to start if
automatic reset has been selected. Otherwise, press
Off/ to reset the alarm. The specific code will appear
Reset
in the display.
Alarm locked
The CU 321 will stop running and the AC power must
be cycled to reset the alarm. Alarm locked is the
most severe type of alarm indicating that there is
something wrong in the installation.
The yellow and red indicator lights on the CU 321 will
light up during an alarm-locked situation. The spe-
cific code will appear in the display.
Indicator lights on display
Warning/alarm LED indications
Warning Yellow
Alarm with reset Red
Alarm locked Yellow and red
Status of the alarm
Alarm with
Warning
reset
x
x x
x
x
x
x
x
x
x x
x
x
Alarm
locked
x
x
x
x
x
x
x
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