Viessmann VITOTRONIC 300 Installation And Service Instructions Manual page 54

Troubleshooting, Vitotronic 300, GW5B
Fault Codes
(continued)
Displayed fault System characteristics Cause
code
AD Control mode.
B0 Control mode.
B1 Control mode.
B5 Control mode.
B6 Control mode.
B7 Boiler is regulated
by the temperature
controller.
B8 Control mode.
BF Control mode.
No communication via
LON.
C1 Boiler cools down.
C8 Boiler cools down.
C9 Boiler cools down.
CA Boiler cools down
CB Boiler cools down
CE Control mode.
CF Control mode.
No communication via
LON.
D1 Boiler cools down
D2 Control mode.
D4 Boiler cools down
54
Vitotronic 300, GW5B & MW1B Installation and Service
Butterfly valve configuration error:
Code "0C:2", "0C:
3" or "0C:4" in group 2 "Boiler"
is set and code "4E:1" in group 1
"General" is set.
Short circuit, flue gas temperature
sensor
Communication fault, programming
unit
Internal fault
Invalid hardware recognized
Boiler coding card faulty
Lead break, flue gas temperature
sensor
Incorrect LON communication
module
External safety equipment at plug
abÖ
Fault, low water
indicator at "X7" of plug-in adaptor 1
for external safety equipment
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 high limit safety cut-out
fault
or
temperature limiter at "X1" of
plug-in adaptor 1 for external safety
equipment
Communication fault, plug-in adaptor
1 for external safety equipment
Communication fault, LON
communication module of control
unit
Burner fault
Communication fault, plug-in adaptor
2 for external safety equipment
The high limit safety cut-out has
responded or fuse F2 has blown
Measures
With butterfly valve:
Set code "4E:0" in group 1
"General".
Without butterfly valve:
Set code "0C:1" in group 2 "Boiler".
Check the flue gas temperature
sensor (see page 110).
Check connections and replace the
programming unit if required.
Check PCB and plug-in connections;
replace PCB if required.
Check coding address
"92" in group 1 "General";
"92:161" must be set.
Plug in boiler coding card or replace.
Check the flue gas temperature
sensor (see page 110).
Without flue gas temperature
sensor:
Set code "1F:0" in group 2 "Boiler".
Replace LON communication
module.
Check connection and external
safety equipment.
Check the system water level; reset
low water indicator.
Check system pressure; reset
maximum pressure limiter.
Check system pressure, reset
minimum or maximum pressure
limiter 2.
Check system temperature; reset
high limit safety cut-out.
Check plug-in adaptor.
Without plug-in adaptor:
Set code "30:0" in group 1 "General".
Check LON communication module
and replace if required.
Check the burner
Check plug-in adaptor.
Without plug-in adaptor:
Set code "31:0" in group 1 "General".
Check the high limit safety cut-out or
the burner, burner loop and fuse F2.