Viessmann VITOTRONIC 200 Installation And Service Instructions Manual page 73

Vitotronic 200 and 300-K Installation and Service
Fault Display Vitotronic 300-K
Fault codes
Displayed fault code System characteristics
B6 Constant mode.
BA Mixing valve "Closed".
BC Control mode without
remote control.
BD Control mode without
remote control.
BE Control mode without
remote control.
BF Control mode.
No communication via
LON.
C2 Control mode.
CF Control mode.
No communication via
LON.
D3 Control mode.
D5 Boiler ramps up to
electronic maximum
boiler water temperature
limit.
D6 Control mode.
D7 Control mode.
D8 Control mode.
(continued)
Cause
Invalid hardware recognized Check coding address
Communication error,
PCB extension for heating
circuits 2 and 3 with mixing
valve
Communication error,
remote control Vitotrol
heating circuit without
mixing valve A1 (heating
circuit 1)
Communication error,
remote control Vitotrol
heating circuit with mixing
valve M2 (heating circuit 2)
Communication error,
remote control Vitotrol
heating circuit with mixing
valve M3 (heating circuit 3)
Incorrect LON
communication module
Lead break, KM
BUS to solar control module
or Vitosolic
LON communication
module fault
Communication error
extension EA1
The boiler does not "log in"
at the cascade control unit.
Input DE1 at extension
EA1 reports a fault
Input DE2 at extension
EA1 reports a fault
Input DE3 at extension EA1
reports a fault
Troubleshooting
Measures
"92" in "General" group;
"92:166" must be selected.
Note: Code "8A:176" must be
selected for coding address
"92" to be displayed.
Check insertion of PCB and ribbon
cable; replace PCB if required.
Check connections for cable
(see separate installation and service
instructions) and coding address "A0"
in the "Heating circuit..." group.
Check connections for cable
(see separate installation and service
instructions) and coding address "A0"
in the "Heating circuit..." group.
Check connections for cable
(see separate installation and service
instructions) and coding address "A0"
in the "Heating circuit..." group.
Replace LON communication module.
Check KM BUS cable and device.
Without solar control unit:
Set code "54:0" in the "General"
group.
Check LON communication module
and replace if required.
Check connections
(see page 134).
Without extension EA1:
Set code "5B:0" in the "General"
group.
Check communication via participant
check, lines
to Vitotronic 100 and codes
Remove fault at appliance concerned.
Remove fault at appliance concerned.
Remove fault at appliance concerned.
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