Viessmann VITOTRONIC 200 Installation And Service Instructions Manual page 51

Vitotronic 200, HO1B and 300-K, MW2C Installation/Service
Fault Codes
(continued)
Fault codes
Displayed fault code System characteristics
b5 Control mode.
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.
Cause
Internal fault
Invalid hardware recognized Check coding address
Communication fault,
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
Communication fault,
control unit LON
communication module
Troubleshooting
Measures
Check correct insertion
of PCB (see parts list).
"92" in "General" group;
"92:188" must be set.
Note: Code "8a:176" must be set
in order to display coding
address "92".
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. With
wireless remote control: Place the
remote control near the wireless base
station and check connection.
Check connections for cable
(see separate installation and service
instructions) and coding address "a0"
in the "Heating circuit..." group. With
wireless remote control: Place the
remote control near the wireless base
station and check connection.
Check connections for cable
(see separate installation and service
instructions) and coding address "a0"
in the "Heating circuit..." group. With
wireless remote control: Place the
remote control near the wireless base
station and check connection.
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. If no LON
communication module is installed,
set coding "76:0" in the "General"
group.
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