Exhausto EXact2 VEX240 series, Basic Instructions

Page: 85 / 108

Cooling unit
Unit
Fault code
Category
Alarm description
Troubleshooting
(See appendix 1: "Simplified diagrams" for the positioning of dampers,
sensors, air directions, etc.)
xx yy z
25 08 3 Outdoor air duct tem-
perature sensor short-
circuited ● Check the sensor's resistance complies with the actual tem-
perature. See temperature resistance table appendix 2.
● If the sensor resistance has significantly changed in value, it
should be replaced.
25 15 3 Cooling control detec-
ted but not selected in
VEX configuration The cooling unit is configured in Menu 3.3 VEX configuration
25 16 3 No modbus communi-
cation to cooling con-
trol ● Check the modbus cable between the connection board and
the MCUC module.
● Check the modbus cable from the MCUC module to the other
units for faulty wiring
External cooling unit (MXCU) sensor
Unit
Fault code
Category
Alarm description
Troubleshooting
(See appendix 1: "Simplified diagrams" for the location of dampers, sen-
sors, air directions, etc.)
xx yy z
27 01 4 Supply air duct temper-
ature sensor discon-
nected ● Check the sensor's resistance complies with the actual tem-
perature. See temperature resistance table appendix 2.
● If the sensor resistance has significantly changed in value, it
should be replaced.
27 02 4 Supply air duct temper-
ature sensor short-
circuited ● Check the sensor's resistance complies with the actual tem-
perature. See temperature resistance table appendix 2.
● If the sensor resistance has significantly changed in value, it
should be replaced.
3005167-2022-02-02
Alarms
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