JULABO CF40 Cryo-Compact Circulators - Manual (Page 26)

Troubleshooting guide / Error messages
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8. Troubleshooting guide / Error messages
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Whenever the microprocessor electronics registers a failure, a
complete shutdown of the compressor and circulating pump is
performed. The alarm light " " illuminates and a continuous
signal tone sounds. The LED temperature display indicates the
cause for the alarm in form of a code.
Press enter to quit the audible signal.
 The Cryo-Compact Circulator is operated without bath fluid, or
the liquid level is insufficient.
Replenish the bath tank with the bath fluid.
 Tube breakage has occured (insufficient filling level due to
excessive bath fluid pumped out). Replace the tubing and
replenish the bath tank with the bath fluid.
 Cable of the working temperature sensor interrupted or short-
circuited.
 Defect of the working or excess temperature sensor.
Working temperature and excess temperature sensors report a
temperature difference of more than 35 K.
 Error in A/D converter
 The excess temperature value lies below the working
temperature setpoint. Set the excess temperature to a higher
value.
 Cable of the excess temperature sensor interrupted or short-
circuited.
Cancel the alarm state.
Press the mains power switch off. After eliminating the malfunction,
press the mains power on again to cancel the alarm state.
If the unit cannot be returned to operation, contact an authorized
service station.
Warning without a complete shutdown of the unit:
 Cooling of the condenser is affected.
Clean air-cooled condenser. (see page 34).