Julabo MV-4 - Troubleshooting and Error Messages; Error Code Explanations

Troubleshooting guide / Error messages
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7. 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.
Cause Remedy
• 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.
• The safety temperature value lies
below the working temperature
setpoint.
• Set the safety
temperature to a higher
value.
• A heat reaction or sudden
temperature increase, e.g. caused
by an exothermic chemical
reaction or by the immersion of
preheated samples.
• Set the safety
temperature to a higher
value.
After eliminating the malfunction, press the mains power switch
off and on again to cancel the alarm state.
• The wires of the working temperature sensor are interrupted
or short-circuited.
• Defect of the working or safety temperature sensor.
The difference between the working temperature and safety
sensors is above 25 °C.