Viessmann VITODENS 222-F Installation And Service Instructions Manual page 85

Fault messages
(cont.)
Fault number System characteristics
on the display
F.455 Burner in a fault state
F.456 Burner in a fault state
F.457 Burner in a fault state
F.458 Burner locked out
F.461 Burner in a fault state
F.462 Burner in a fault state
F.463 Burner in a fault state
Cause
Error in logical program
run monitoring
System status at system
start
Fan blocked
Internal error
Feedback signal of flue
gas damper connection at
EM-EA1 extension input
(DIO electronics module)
preventing burner start.
LPG safety valve (sole-
noid valve) at EM-EA1 ex-
tension does not open
(DIO electronics module).
Ionisation current too low
during calibration
Troubleshooting
Measures
Reset the appliance.
Reset the appliance.
Check free movement of the impel-
ler. Replace the fan unit if required.
Reset the appliance.
Restart the heat generator. If nec-
essary, reset the appliance.
Check flue gas damper connection
at EM-EA1 extension (DIO elec-
tronics module).
Reset the appliance.
Check solenoid valve connection
at EM-EA1 extension (DIO elec-
tronics module).
Reset the appliance.
Check ionisation electrode and
connecting cable. Check plug-in
connections for loose contacts.
Heat generator installation
and service instructions
Check flue system; remove flue
gas recirculation if required.
Reset the burner.
Note
Deposits on the electrodes indicate
foreign bodies in the combustion
air. Check the installation room and
flue system for causes of the de-
posits. For example: Laundry de-
tergents, cleaning agents, toilet-
ries, deposits in the ventilation air
supply (chimney).
If burner gauze assembly and ioni-
sation electrode have been re-
placed, also clean fan unit, gas/air
channel and Venturi extension.
Reset the appliance.
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