JULABO LC 4 Temperature controller - Manual (Page 28)

Troubleshooting guide / Error messages
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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 heating device connected to the controller
is performed. The alarm light "
" illuminates and a continuous
signal tone sounds.
Press enter to turn off the signal tone.
Cause
Remedy
 The safety temperature value lies
below the working temperature
setpoint.
Set the safety temperature to
a higher value.
 A sudden temperature increase,
e.g. caused by the immersion of
preheated samples.
Set the safety temperature to
a higher value.
After eliminating the malfunction, press the mains power switch off
and on again to cancel the alarm state.
 The wires of the working temperature sensor are interrupted or
short-circuited.


other errors

After eliminating the malfunction, press the mains power switch off
and on again to cancel the alarm state.
If the error reappears, contact an authorized JULABO service station.
If necessary have the unit checked by a JULABO service technician.
Mains fuses
 The mains fuses on the rear of the unit may easily be
exchanged as shown on the left.
(Fine fuse T 10.0 A, dia. 5 x 20 mm)
Warning:
Before exchanging the fuses, turn off the mains power switch and disconnect
the power plug from the mains socket!
Use only fine fuses with the specified nominal value.