JULABO Magnum 91 Temperature System - Manual (Page 72)

Remote control
72
Error messages Description
-46 COMPRESSOR STAGE 2
PRESSURE TO HIGH FOR A LONG
TIME ON LOW PRESSURE SIDE
The compressor of stage 2 does not start.
5 minutes after stage 1 is switched on, the pressure of stage 2
does not fall below a determined value. Therefore stage 2 does
not start.
Cancel the alarm state by turning the mains switch off (wait about
4 seconds) and by turning the switch on again in order to restart
the unit.
If the error reappears after switching the unit on again, the
refrigerant circuit of stage 1 needs to be checked by a specialist.
-47 COMPRESSOR STAGE 2 TO LONG
ABOVE HIGH PRESSURE
The cooling system is surcharged, and the compressor of stage 2
was switched off.
Before the WARNING CODE 42 is shown for more than two
hours. In order to avoid the destruction of the compressor, the
refrigerant cycle of stage 2 should be checked by a specialist.
-48 COMPRESSOR STAGE 2 TO OFTEN
SWITCH ON/OFF
Caused by WARNING CODE 43 the compressor of stage 2 has
switched off 5 times within one hour.
If after a certain time there was a pressure compensation, the
alarm status can be cancelled by switching off and on at the mains
switch, and the unit is ready to operate again.
In order to avoid the destruction of the compressor, the refrigerant
circuit should first be checked by a specialist.
-49 PRESSURE SENSOR ALARM LOW
PRESSURE SIDE STAGE 2
The pressure sensor of stage 2 (evaporation pressure, low
pressure side) is bypassed or has a line interruption.
Have the repair done by a specialist.
-50 PRESSURE SENSOR ALARM HIGH
PRESSURE SIDE STAGE 2
The pressure sensor of stage 2 (high pressure side) is bypassed
or has a line interruption.
Have the repair done by a specialist.