Viessmann Vitotronic 200 Installation And Service Instructions Manual page 64

Troubleshooting
Faults that are displayed at the programming unit
Fault code System character-
on the dis- istics
play
CE Control mode
CF Control mode
d1 Boiler cools down
d4 Boiler cools down
d6 Control mode
d7 Control mode
d8 Control mode
LON subscribers fault messages
Precondition:
The control unit must be programmed
as fault manager (code "79:1").
64
Cause Measures
Communication Check plug-in adaptor
fault plug-in (see page 119).
adaptor for exter- Without plug-in adaptor:
nal safety equip- Set code "94:0"
ment
LON communica- Replace LON communi-
tion module fault cation module (see
page 107).
Without module:
Set code "76:0"
Burner fault Check the burner (see
page 30)
The high limit Check the high limit
safety cut-out has safety cut-out or the
responded or burner, burner loop and
fuse F2 has blown fuse/MCB F2
Fault at "DE1" in Check connection to
plug-in adaptor "DE1" (see page 120)
for external safety
equipment
Fault at "DE2" in Check connection to
plug-in adaptor "DE2" (see page 120)
for external safety
equipment
Fault at "DE3" in Check connection to
plug-in adaptor "DE3" (see page 120)
for external safety
equipment
(cont.)