Error handling
11.3 Communication error defroster
WARNING!
Communication error defroster
1
backup heater/GHX
regulating flap
Do not touch the board
for under 230 V power
supply live components!
Check system and menu, if
accidentally released /
check DIP in BUS thermostat
Restart
Yes
No
O.K.?
Change
Check
setting
Yes
No
Cat 5 cable
O.K.?
Replace
Replace
BUS thermostat
connection
1
GHX – Ground heat exchanger
59