Operating instructions

47
Troubleshooting
Faults with fault display at the programming unit (cont.)
Fault
code
System
characteristics
Cause Check
ba
Mixer (M2)
continues to control
Communication fault
Extension kit for
mixer circuit M2
Check the extension
kit connections and
coding.
bb
Mixer (M3)
continues to control
Communication fault
Extension kit for
mixer circuit M3
g
Start the extension kit
bc
Control mode
without remote
control
Communication fault
Vitotrol remote
control unit,
Heating circuit A1
Check connections,
cable and coding
address "A0"
bd
Communication fault
Vitotrol remote
control unit,
Mixer circuit M2
be
Communication fault
Vitotrol remote
control unit,
Mixer circuit M3
c1
Boiler cools down External safety
device
H Check the plug
connections aBÖ
H Check all external
safety equipment
H Check the fault
message module
5862Ă297ĂGB