Code 14, Code 15, Code 16 – JULABO LH 85 High Dynamic Temperature System User Manual

Page 60: Code 17, Code 31, Code 03, Code 04, Code 20, Code 21, Code 40

Troubleshooting guide / Error messages

CODE 14

 Safety sensor defect >TANK<
 The safety temperature value lies below the working temperature

setpoint. Set the safety temperature to a higher value.

 The temperature system 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.

CODE 15

 External control selected, but external Pt100 sensor not connected.

CODE 16

 Heating circuit interrupted.

CODE 17

 Heating circuit short-circuited.

CODE 31

 Communication between control module RD and instrument interrupted.

Warning
CODE 40

Warnings without a complete shutdown of the unit

CODE 03

 Excess temperature warning

CODE 04

 Low temperature warning

CODE 20

 Cooling of the condenser is affected. Clean air-cooled condenser.

Check the flow rate and cooling water temperature on water-cooled
condenser.

CODE 21

 Compressor stage 1 does not work.

Check mains circuit breakers F1 and F3, both might have triggered.
Reset circuit breakers if necessary (see below).

CODE 40

 Low liquid level warning in the internal reservoir

CODE 41

 High liquid level warning in the internal reservoir. (LH85)



 These messages appear every 10 seconds as long as the compressor

is not switched on although requested by the instrument.

 After a short cooling interval, the motor will be automatically

reconnected and the message

CODE XX

no longer appears.

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