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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 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.
• Defect of the working or safety temperature sensor.
• The safety temperature value lies below the working
temperature setpoint.
Set the excess temperature protection to a higher value.
• The 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.
• The wires of the working temperature sensor are interrupted or
short-circuited.
• Error in A/D converter
After eliminating the malfunction, press the mains power switch off
and on again to cancel the alarm state.
If the unit cannot be returned to operation, contact an authorized
JULABO service station.
Disturbances that are not indicated.
Pump motor overload protection
The pump motor is protected against overloading. After a short
cooling interval, the motor will automatically start running.
Cooling compressor overload protection
The motor of the cooling compressor is equipped with an overload
protector, which will be activated by excessive temperature in the
capsule or by excessive current consumption. Poor air circulation
(distance to walls, dirt accumulated on condenser) may cause the
motor to be disconnected. After a short cooling interval, the motor
will be automatically reconnected.
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