JULABO HT30-M1 High Temperature Circulator - Manual (Page 56)

Troubleshooting guide / Error messages
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9. Troubleshooting guide / Error messages
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Whenever the microprocessor electronics registers a failure, a complete shutdown
of the circulator is performed. The alarm light " " illuminates and a continuous
signal tone sounds.
• The circulator is operated without bath liquid, or the liquid level is insufficient.
Replenish the bath tank with the bath liquid.
• Tube breakage has occured (insufficient filling level due to excessive bath
liquid pumped out). Replace the tubing and replenish the bath tank with the
bath liquid.
• The float is defect (e. g., because damaged in transit). Repair by authorized
JULABO service personnel.
• Failure of one or both temperature sensors of the CU-unit.
• The cooling water temperature value lies below 5 °C.
• Cable of the working temperature sensor interrupted or short-circuited.
• Defect of the working or safety temperature sensor.
Working temperature and safety sensors report a temperature difference of
more than 100 K.
• Other errors (I 2
C-BUS errors)
• Error in A/D converter.
• Safety sensor defect.
•
The safety temperature value lies below the working temperature setpoint.
Set the safety temperature to a higher value.
• External control selected, but external Pt100 sensor not connected.
• Error in the measuring system of the external temperature sensor „EXT“.
• Error at the internal Interface
• Safety sensor 1:
Cable of the safety sensor 1 interrupted or short-circuited.
• Safety sensor 2:
Cable of the safety sensor 2 interrupted or short-circuited.
• Safety sensor 3:
Cable of the safety sensor 3 interrupted or short-circuited.
• Safety sensor in the cooling zone:
Cable of the safety sensor interrupted or short-circuited.