Maintenance - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Fault codes
(cont.)
Fault code Const.
displayed
Fd X
FE X
FF X
Note
If subscriber faults occur, "Subscriber fault ..." is dis-
played.

Maintenance

!
Please note
Residual water will escape when the boiler or
one of the following components is fitted or
removed:
■ Water-filled pipework
■ Circulation pumps
■ Plate heat exchanger
Components fitted in the heating water or
■
DHW circuit
Water ingress can result in damage to other
components.
Protect the following components against
ingress of water:
Control unit (in particular in the service posi-
■
tion)
■ Electrical components
■ Plug-in connections
■ Cables and leads
Weather- System characteris-
comp. tics
X Burner in a fault state Burner control unit
X Burner blocked or in
a fault state
X Burner blocked or in
a fault state
Cause Measures
Check ignition electrodes
fault and connecting cables.
Check whether a strong
interference (EMC) field
exists near the appliance.
Press reset button R.
Replace control unit if
fault persists.
Boiler coding card Press reset button R. If
or main PCB faulty, the fault persists, check
or incorrect boiler the boiler coding card and
coding card replace boiler coding card
or control unit if necessa-
ry.
Internal fault or re- Restart the appliance. Re-
set button R disa- place the control unit if
bled the appliance will not re-
start.
Troubleshooting
89