JULABO LH 85 High Dynamic Temperature System - Manual (Page 59)

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9. Troubleshooting guide / Error messages
The temperature control system LH46 is provided with a single-stage
refrigerant cycle (1 compressor).
In order to reach a working temperature range of up to –85 °C, the
temperature control system LH85 is provided with a two-stage refrigerant
cycle ( 2 compressors) For this reason there are a few additional warnings
and alarm messages for the LH85 (see page 61).
+

ALARM
CODE 14
Whenever the microprocessor electronics registers a failure, a complete
shutdown of the temperature system is performed.
The VFD-Info-Display indicates the cause for the alarm in form of a code.
The alarm light " " illuminates and a continuous signal tone sounds.
CODE 01
Low liquid level alarm in the internal reservoir (LH85)
 The temperature system 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 float is defect (e. g., because damaged in transit). Repair by
authorized JULABO service personnel.
CODE 02
 Defect temperature sensor in refrigeration circuit.
Repair by authorized JULABO service personnel.
CODE 05
 Cable of the working temperature sensor interrupted or short-circuited.
CODE 06
 Defect of the working or safety temperature sensor.
Working temperature and safety sensors report a temperature
difference of more than 50 K.
CODE 07
 Other errors (I 2
C-BUS errors)
CODE 12
 Error in A/D converter.
CODE 13
 Sensor in the internal reservoir >RES< is defect
 The safety temperature value lies below the working temperature
setpoint. Set the safety temperature to a higher value.