Viessmann Vitotronic 200 Installation And Service Instructions Manual page 63

Faults that are displayed at the programming unit
Fault code System character-
on the dis- istics
play
bF Control mode
C1 Boiler cools down
C2 Control mode
C4 Control mode
C8 Boiler cools down
C9 Boiler cools down
CA Boiler cools down
Cb Boiler cools down
Cause Measures
Incorrect LON Replace LON communi-
communication cation module (see
module page 107)
External safety Check plug aBÖ and ex-
device ternal safety equipment
(see page 26)
KM BUS connec- Check KM BUS cable
tion lead broken and the solar control
to solar heating unit.
control unit Without solar control
unit:
Set code "54:0"
Communication Check connections and
fault, function ex- cables/leads; if required
tension 0 - 10 V replace the function ex-
tension (see page 118).
Without function exten-
sion:
Set code "9d:0"
Low water indica- Check the water level of
tor fault the system; reset low
water indicator (see
page 121)
Maximum pres- Check the system pres-
sure limiter fault sure; reset the maxi-
mum pressure limiter
(see page 121)
Minimum or maxi- Check system pressure,
mum pressure reset minimum or maxi-
limiter 2 faults mum pressure limiter 2
(see page 121)
Additional high Check the system tem-
limit safety cut- perature; reset the high
out fault limit safety cut-out or
or flue gas damper (see
Temperature limit- page 121)
er
or
Flue gas damper
Troubleshooting
(cont.)
63