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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 heater and circulation pump 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.
• During the self-test after switch-on a short-circuit is registered between
pin 2 and pin 4 of the control cable or the control cable is interrupted
during operation.
Reconnect the cable or eliminate the short-circuit.
• 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 25 °C.
• Other 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.
• Heating circuit interrupted.
• Heating circuit short-circuited.
• Defective alarm relay.
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