JULABO LH 50 Highly Dynamic Temperature Control Systems - Manual (Page 72)

Cleaning the unit
72
Error messages Description
-15 EXTERNAL SENSOR ALARM External control selected, but external Pt100 sensor
not connected.
-16 TRIAC/RELAY CONNECTION OPEN Heating circuit interrupted.
-17 TRIAC SHORTED Heating circuit short-circuited.
-20 WARNING: CLEAN CONDENSOR OR
CHECK COOLING WATER CIRCUIT
OF REFRIGERATOR
Cooling of the condenser is affected.
Clean air-cooled condenser.
Check the flow rate and cooling water temperature
on water-cooled condenser.
-21 WARNING: COMPRESSOR STAGE 1
DOES NOT WORK
Compressor stage 1 does not work.
Check mains circuit breakers F1 and F3, both might
have triggered.
Reset circuit breakers if necessary.
-26 WARNING: STAND-BY PLUG IS
MISSING
External stand-by contact is open.
Stand-by input - see pages 46 and 6.
-31 INTERNAL COMMUNICATION
ERROR
Communication between remote module RD and
instrument interrupted.
-40 NIVEAU LEVEL WARNING Low liquid level warning in the internal reservoir.
12. Cleaning the unit
Caution:
Always turn off the unit and disconnect the mains cable from the power source
before cleaning the unit.
Prevent humidity from entering into the circulator.
Electrical connections and any other work must be performed by qualified
personnel only.
Cleaning the unit outside
 Clean the outside of the unit using a wet cloth and low surface
tension water (e.g., soap suds).
Before applying a cleaning or decontamination method different from the
one recommended by JULABO, the user has to make sure with the
manufacturer, that the planned method does not damage the unit.