Viessmann Vitotronic 100 GC1 Installation And Service Instructions Manual page 103

Faults displayed at the programming unit
Fault
System characteristics
code
b b b b c c c c
Control mode without remote
control
b b b b d d d d
b b b b e e e e
b b b b f f f f
Control mode
c c c c 2 2 2 2
c c c c 4 4 4 4
c c c c e e e e Control mode
c c c c f f f f
d d d d 5 5 5 5 Boiler drives up to electronic
maximum limit
Control mode
d d d d 6 6 6 6
d d d d 7 7 7 7
d d d d 8 8 8 8
(cont.)
Cause
Communication error
Vitotrol remote control,
System circuit A1
Communication error
Vitotrol remote control,
Mixing valve circuit M2
Communication error
Vitotrol remote control,
Mixing valve circuit M3
Incorrect LON communication
module
Open circuit
KM BUS to solar control unit
Faulty communication with Input
Module
0 to 10 V
Communication error
Plug-in adaptor for external safety
equipment
Error
LON communication module
Boiler does not log in at cascade
Fault at DE1 in plug-in adaptor for
external safety equipment
to DE1
to DE2
to DE3
Troubleshooting – Vitotronic 300-K, MW1S
Remedy
Check connections, cable, coding
address A0 and remote control DIP
switches (see page 137 and 154) switches (see page 137 and 154)
Replace communication module
Check KM BUS cable and solar
control unit
Without solar control unit:
Set coding 54 : 0
Check connections and
cables/leads; replace Input Module,
if required
(see page 137)
Without Input Module:
Set coding 9d : 0
Check plug-in adaptor for external
safety equipment and cables/leads
Without plug-in adaptor:
Set coding 94 : 0
Replace communication module
Check communication (e.g.
participant check), cables to
Vitotronic 100 and coding (see from
page 73)
Check electrical connections on
DE1 to DE3
103