Viessmann Vitotronic 200 Installation And Service Instructions For Contractors page 104

Troubleshooting
Fault messages
(cont.)
CB Fault message module 1, input 4: Max. pressure 2
Boiler cools down.
Cause
Fault in additional high limit safety cut-out or tempera-
ture limiter at "X1" of plug-in adaptor 1 for external
safety equipment
CE Communication error, fault message module 1
Control mode
Cause
Communication error, plug-in adaptor 1 for external
safety equipment
CF Communication error, LON communication module
Control mode
■
No communication via LON
■
Cause
Communication error, LON communication module of
the control unit
D1 Burner fault, boiler
Boiler cools down.
Cause
Burner fault, boiler
D2 Communication error, fault message module 2
Control mode
Cause
Communication error, plug-in adaptor 2 for external
safety equipment
D3 Communication error, EA1 extension
Control mode
104
Measure
Check the system temperature.
Resetting the high limit safety cut-out: See chapter
"Plug-in adaptor for external safety equipment"
Measure
Checking the plug-in adaptor: See chapter "Plug-in
adaptor for external safety equipment"
Without plug-in adaptor: Set parameter "14:0" in the
"General" group.
Measure
Check LON communication module and replace if re-
quired.
If no LON communication module is installed, set pa-
rameter "76:0" in the "General" group.
Measure
Check the burner.
Measure
Checking the plug-in adaptor: See chapter "Plug-in
■
adaptor for external safety equipment"
Without plug-in adaptor:
■
Set parameter "15" in the "General" group.