JULABO CF41 Cryo-Compact Circulators - Manual (Page 64)

Troubleshooting guide / Error messages
64
ALARM
CODE 06

Difference between
working- and safety-
temp. Bigger than
permissible value.
 Defect of the working or excess temperature sensor.
Working temperature and excess temperature sensors report a
temperature difference of more than 35 K.
ALARM
CODE 07

The internal I2C
bus-system shows
a failure.
 Other errors (I
2 C-BUS errors)
ALARM
CODE 12

Error in A/D-
converter of the
internal measuring
system.
 Error in A/D converter
ALARM
CODE 14

Working temperature
exceeds the adjusted
safety temperature.
 Excess temperature sensors defect.
 The excess temperature value lies below the working temperature
setpoint. Set the excess temperature to a higher value.
ALARM
CODE 15

External control
selected, but ext.
sensor not connected
or defective.
 External control selected, but external Pt100 sensor not connected
or defect.
WARNING
CODE 20

Cooling is affected
or ambient temperature
to high
Clean condenser
 Cooling of the condenser is affected. Clean air-cooled condenser.
Check the flow rate and cooling water temperature on water-cooled
condenser.
WARNING
CODE 21

Compressor does not
work. Compressor
will be automatic-
ally reconnected.
 Compressor does not work.
After a short cooling interval, the compressor motor will be
automatically reconnected and the message "CODE 21" no longer
appears.
ALARM
CODE 33

Internal safety-
temperature sensor
short-circuited or
interrupted.
 Cable of the excess temperature sensor interrupted or short-circuited