JULABO TW20 Water Baths - Manual (Page 21)

Water Baths
21
8. Troubleshooting guide / Error messages
+

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.
 Safety sensor or working temperature sensor.
 The water bath is operated without bath fluid, or the liquid level is
insufficient.
Replenish the bath tank with the bath fluid.
 Cable of the working temperature sensor interrupted or short-
circuited.
1
2
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.
9. Cleaning / repairing the unit
Caution:
Improper maintenance or repair can result in electric shock or damage to the
unit.
 Repairs and any other work are to be carried out only by qualified service
personnel authorized by JULABO GmbH.
 Always turn off the unit and disconnect the mains cable from the power
source before performing any service or maintenance procedures, or
before moving the unit.
 Prevent humidity from entering into the water bath.
 Do not use alcohol-based or solvent-based cleaning agents.
These cleaning agents will result in damage and cracks in the Makrolon
cover.