13 Fault rectification | UK
95
Fault /
Failure of
Message
Possible cause
Ackn.
Supply air
fan
Supply air fan fault
Break in a cable,
fan defective
M
Exhaust air
fan
Exhaust air fan
fault
Break in a cable,
fan defective
M
Communication
with main control
unit (comfort
control unit)
Communication
with main control
unit fault
Break in a cable;
main control unit
defective; wiring
incorrect
A
Sensor T-outside
air upstream of
EHE
Temperature
sensor, upstream
of EHE, fault
Break in a cable;
temperature
outside measuring
range
A
Unit
T-air inlet
sensor
Unit inlet tempera-
ture sensor fault
Break in a cable;
temperature outside
measuring range
A
Sensor
T-outgoing air
Outgoing air tem-
perature sensor
fault
Break in a cable;
temperature outside
measuring range
A
Sensor
T-supply air
Supply air temper-
ature sensor fault
Break in a cable;
temperature
outside measuring
range
A
Sensor
T-room external
External room
temp. sensor fault
Break in a cable;
temperature outside
measuring range
A
Fault /
Failure of
Message
Possible cause
Ackn.
Sensor T-room
control unit
Temperature
sensor control unit
fault
Break in a cable;
temperature
outside measuring
range; main con-
trol unit defective
A
Sensor
T-room bus
Temperature sen-
sor KNX fault
No data telegram
for room tempera-
ture in the last
15 minutes
A
System
memory
System memory
fault
Checksum error
of stored parame-
ters; load commis-
sioning data
M
System bus
System bus fault
Internal error;
contact specialist
A
Combi sensor
(exhaust air
humidity/
temperature)
Humidity /
temperature
sensorfor exhaust
air fault
Break in a cable;
humidity/tem-
perature outside
measuring range
A
Additional circuit
board 1
ZP 1 communica-
tion fault
Break in a cable;
ZP1 defective, in-
correct DIP switch
setting on ZP 1
A
Additional circuit
board 2
ZP 2 communica-
tion fault
Break in a cable;
ZP 2 defective, in-
correct DIP switch
setting on ZP 2
A
