JULABO FT902 Immersion Coolers - Manual (Page 20)

Troubleshooting guide / Error messages
20
The temperature curve resembles a two-point control (on-off).
Response time and amplitude of the temperature curve are depending
on the volume of the bath fluid (amongst others).

According to manufacturer's instructions, there is an off-period of
minimum 4 minutes to protect the compressor.
Caution:
The immersion probe – as part of the cooling circuit – should not be exposed to
bath temperatures above the working temperature of the immersion cooler.
This would cause damage to the compressor.
Do not immerse a frosted immersion probe into hot bath oil.
DANGER OF INJURY!
7. Troubleshooting guide / Error messages
+

Whenever the microprocessor electronics registers a failure, a complete
shutdown of the compressor 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.
Press enter to quit the audible signal.
 Cable of the working temperature sensor interrupted or short-
circuited.
 The temperature inside the bath is outside the working temperature
range.
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.
15
A
M
P
Mains circuit breakers (resettable)
FT402 10 A
FT902 15 A