Maico WS 470 Series Operating Instructions Manual page 65

Fault / Message
Failure of Possible cause
Sensor T-room Temperature
control unit sensor control unit
fault
Break in a cable;
temperature
outside measuring
range; main con-
trol unit defective
Sensor Temperature sen-
T-room bus sor KNX fault
No data telegram
for room tempera-
ture in the last
15 minutes
System memory System memory
fault
Checksum error
of stored parame-
ters; load commis-
sioning data
System bus System bus fault
Internal error; con-
tact specialist
Combi sensor Humidity / temper-
(exhaust air ature sensor
humidity/ for exhaust air
temperature) fault
Break in a cable;
humidity/tem-
perature outside
measuring range
Additional circuit ZP 1 communica-
board 1 tion fault
Break in a cable;
ZP1 defective, in-
correct DIP switch
setting on ZP 1
Additional circuit ZP 2 communica-
board 2 tion fault
Break in a cable;
ZP 2 defective, in-
correct DIP switch
setting on ZP 2
Ackn. Fault /
Failure of
A Bypass
Supply air temper-
ature too cold
A
Exhaust air tem-
perature too cold
M
Frost protection
A
A
Zone shutter
External
A preheating
Pressure consist-
ency setpoint
not reached
A
18 Faults | UK
Message Ackn.
Possible cause
Bypass fault
Motor defective,
foreign body block-
ing mechanics
Temperature of
supply air
too cold
Heat exchanger
iced over, PTC
heat exchanger
defective
Temperature of
exhaust air
too cold
Exhaust air in unit
too cold, apart-
ment cooled
Frost protection
fault
Break in a cable,
heating module
defective, tem-
perature switch
on heat register
defective
Shutter fault
Motor defective,
foreign body
blocking
mechanics
External preheat-
ing fault
External preheat-
ing defective
Pressure consist-
ency fault
Setpoint is not
reached
M
A
A
M
M
M
M
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