Viessmann VITOTRONIC 100 Installation And Service Instructions Manual page 119

Faults which are displayed at the programming unit
Fault
System
code
characteristics
Control mode
ce
cf
Boiler cools down
d1
d4
Control mode
d6
d7
d8
Cause
Communication
fault plug−in
adaptor for external
safety equipment
Fault
LON
communication
module
Burner fault
High limit safety
cut−out has
responded or fuse/
MCB F2 has
blown/tripped
Fault at "DE1"
Fault at "DE2"
Fault at "DE3"
Troubleshooting
(cont.)
Remedy
Check plug−in
adaptor for external
safety equipment
(see page 135) and
connecting cable.
Without plug−in
adaptor, set code
"94 : 0"
Replace
communication
module
(see page 128).
Without
communication
module
Set code "76 : 0"
Check burner
(see page 89)
Check high limit
safety cut−out or
burner, burner loop
and fuse F2
(see page 61)
Check connections
at inputs "DE1" to
"DE3" in plug−in "DE3" i l i
adaptor for
external safety external safety
equipment
(see page 135)
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