Operating instructions
117
Troubleshooting
Faults which are displayed at the programming unit (cont.)
Fault
code
System
characteristics
Cause Remedy
b1
Control mode Communication
error
Programming unit
Check connections
and replace
programming unit if
necessary (see page
128)
b4
Emissions test
mode
Internal electronics
fault
Check electronics
PCB.
bC5
Control mode
Replace, if required
bC6
Constant mode Invalid
hardware ID
Set code "92:160"
b7
Boiler is regulated
by control
thermostat
Boiler coding card
faulty
Plug in boiler coding
card or replace it, if
faulty (see page 60)
bC8
Control mode Lead broken
Flue gas
temperature sensor
Checking flue gas
temperature sensor
(see page 132).
Without flue gas
temperature sensor
Set code "1F:0"
bf
Incorrect LON
communication
module
Replace
communication
module
(see page 128)
c1
Boiler cools down External safety
device
Connection
Check plug aBÖ and
external safety
equipment
(see page 84)
c2
Control mode Lead broken
KM BUS to solar
control unit
Check KM BUS cable
and solar control unit
Without solar control
unit, set code "54:0"
5862730GB