Exhausto EXact2 VEX240 series, Basic Instructions

Page: 78 / 108

HC Sensor
Device
Fault code
Category
Alarm description
Troubleshooting
(See appendix 1: "Simplified diagrams" for the positioning of dampers,
sensors, air directions, etc.)
xx yy z
15 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.
15 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.
15 05 4 Supply water pipe tem-
perature sensor on wa-
ter cooling coil 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.
15 06 4 Supply water pipe tem-
perature sensor on wa-
ter cooling coil 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.
15 07 4 Return water pipe tem-
perature sensor on wa-
ter heating coil 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.
15 08 4 Return water pipe tem-
perature sensor on wa-
ter heating coil 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.
15 09 4 Return water pipe ex-
ternal temperature sen-
sor on water heating
coil disconnected ● 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.
15 10 4 Return water pipe ex-
ternal temperature sen-
sor on water heating
coil is 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.
15 13 4 Heat control internal
temperature sensor
disconnected ● Replace the heat control circuit board MHCW
15 14 4 Heat control internal
temperature sensor
short-circuited ● Replace the heat control circuit board MHCW
15 15 3 No modbus communi-
cation to pressure
transmitter ● Check modbus cable between heat control circuit board and
subsequent MPT
3005167-2022-02-02
Alarms
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