Viessmann VITOTRONIC 100 GC1B Installation And Service Instructions Manual page 90

Troubleshooting
Fault Display
(continued)
Fault Codes
Displayed System Characteristics Cause
Fault Code
C9 Boiler cools down.
CA Boiler cools down.
Cb Boiler cools down.
Cd Control mode.
CE Control mode.
CF Control mode.
No communication via
LON.
d1 Boiler cools down.
d2 Control mode.
d3 Control mode.
d4 Boiler cools down.
d6 Control mode.
d7 Control mode.
d8 Control mode.
90
Fault, maximum pressure limiter at
"X3" of plug-in adaptor 1 for external
safety equipment.
Fault, minimum or maximum pressure
limiter 2 at "X2" of plug-in adaptor 1
for external safety equipment.
Additional fixed high limit fault
or
Temperature limiter at "X1" of
plug-in adaptor 1 for external safety
equipment.
Vitocom 100 communication fault.
Communication fault, plug-in adaptor
1 for external safety equipment.
Communication error, LON
communication module of control unit.
Burner fault.
Communication fault, plug-in adaptor
2 for external safety equipment.
Communication error, extension EA1.
The fixed high limit has responded or
fuse F2 has blown.
Input DE1 at extension EA1 reports a
fault.
Input DE2 at extension EA1 reports a
fault.
Input DE3 at extension EA1 reports a
fault.
Vitotronic 100, GC1B Installation and Service
Measures
Check system pressure; reset
maximum pressure limiter.
Check system pressure, reset
minimum or maximum pressure limiter
2.
Check system temperature; reset fixed
high limit.
Check connections and the Vitocom
100.
Installation and service
instructions Vitocom 100
Without Vitocom 100:
Set code "95:0" in group 1
"General".
Check plug-in adaptor.
Without plug-in adaptor:
Set code "30:0" in group 1
"General".
Check LON communication module
and replace if required.
If no LON communication module
is installed, set code "76:0" in
category 1
"General".
Check burner.
Check plug-in adaptor).
Without plug-in adaptor:
Set code "31:0" in group 1
"General".
Check connections (see page 115).
Without extension EA1:
Set code "5b:0" in category 1
"General".
Check the fixed high limit or the
burner, burner loop and fuse F2.
Remove fault at appliance concerned.
Remove fault at appliance concerned.
Remove fault at appliance concerned.