Viessmann VITODENS 200-W Installation And Service Instructions Manual page 65

Fault codes
(cont.)
Fault code dis- System characteristics
played
C4 Control mode
C5 Control mode, max. pump
speed
Cd Control mode
CF Control mode
d3 Burner in a fault state or
blocked.
d4 Control mode
Burner is operating with a
limited modulation range.
d5 Burner in a fault state.
d6 Control mode
d7 Control mode
d8 Control mode
E0 Control mode
Cause
Communication error,
OpenTherm extension
Communication error, in-
ternal variable speed
pump
Communication error
Vitocom 100, type GSM
(KM-BUS)
Communication error,
LON communication mod-
ule
Communication error, fan
unit
No air flow detected in fan
unit.
Fan blocked
Input DE1 at EA1 exten-
sion reports a fault.
Input DE2 at EA1 exten-
sion reports a fault.
Input DE3 fault at EA1 ex-
tension
External LON subscriber
error
Troubleshooting
Measures
Check OpenTherm extension.
Check the setting of coding ad-
dress "30" in the "Boiler" group
(weather-compensated control
units) or in group 2 (constant tem-
perature control units).
Check Vitocom 100, type GSM
connections and coding address
"95" in the "General" group
(weather-compensated control
units) or in group 1 (constant tem-
perature control units).
Replace LON communication mod-
ule.
Check the connecting cable to the
fan unit.
Press reset button R.
If the fault recurs, replace the fan
unit.
Check the mass flow sensor at the
fan unit. Check the flue system for
flue gas back pressure.
Press reset button R.
Check free movement of the impel-
ler. Replace the fan unit if required.
Remedy fault at appliance con-
cerned.
Remedy fault at appliance con-
cerned.
Remedy fault at appliance con-
cerned.
Check connections and LON sub-
scribers.
65