Viessmann VITOTRONIC 200 Service Instructions Manual page 57

Messages
(cont.)
Message
Code/system characteris-
tics
BE KM BUS remt. ctrl HC3
■ No room temperature-
dependent control for
heating circuit with
mixer M3.
■ No room temperature
hook-up for heating cir-
cuit with mixer M3.
BF Communication module
No communication via
LON.
C2 Power supply
Compressor stops.
C5 Power-OFF
Compressor stops.
Cause
Communication fault KM
BUS remote control heat-
ing circuit with mixer M3.
Incorrect LON communi-
cation module.
Fault in compressor
power supply or phase
monitor faulty.
Power-OFF enabled
(triggered by power sup-
ply utility).
Troubleshooting
Measures
Check heating circuit allo-
cation, connections and
remote control cable.
Replace LON communi-
cation module.
Check connections,
power supply and phase
connection; check phase
monitor.
The switching signal can
be tested at terminal
215.2.
No measures required.
If message persists, first
check connection at termi-
nal X3.7 (feed), then at
terminal X3.6 (230 V~).
(see pages 165, 168
or 170).
57