Viessmann VITOLADENS333-F Service Instructions Manual page 71

Fault codes
(cont.)
Fault code System character-
on the dis- istics
play
C7 Control mode, max.
pump speed
Cd Control mode
CE Control mode
CF Control mode
dA Control mode with-
out room influence
db Control mode with-
out room influence
dd Control mode with-
out room influence
dE Control mode with-
out room influence
E4 Burner blocked
Cause Measures
Communication Check the setting of
fault external coding address "E5".
variable speed
heating circuit
pump, heating
circuit A1
Communication Check connections,
fault Vitocom 100 Vitocom 100 and coding
(KM BUS) address "95".
Communication Check connections and
fault ext. exten- coding address "2E".
sion
Communication Replace the LON com-
fault, LON com- munication module.
munication mod-
ule
Room tempera- Check the room tem-
ture sensor, heat- perature sensor, heating
ing circuit A1 circuit A1.
shorted out
Room tempera- Check the room tem-
ture sensor, heat- perature sensor, heating
ing circuit with circuit with mixer M2.
mixer M2 shorted
out
Room tempera- Check the room tem-
ture sensor, heat- perature sensor, heating
ing circuit A1 lead circuit A1 and the re-
broken mote control DIP switch
settings (see page 93).
Room tempera- Check the room tem-
ture sensor, heat- perature sensor, heating
ing circuit with circuit with mixer M2
mixer M2 lead and the remote control
broken DIP switch settings (see
page 93).
Supply voltage Replace the control unit.
fault
Troubleshooting
71