Viessmann Vitodens 200-W B2HE Installation And Service Instructions Manual page 92

Troubleshooting
Fault messages
(cont.)
Fault number System characteristics
on the display
F.454 Burner in a fault state
F.455 Burner in a fault state
F.456 Burner in a fault state
F.457 Burner in a fault state
F.458 Burner blocked
F.461 Burner in a fault state
F.462 Burner in a fault state
F.463 Burner in a fault state
92
Cause
Incorrect software version
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
Measures
Flash the correct software version
for the BCU burner control unit.
Reset device.
Reset device.
Check free movement of the impel-
ler. Replace the fan unit if required.
Reset device.
Restart the heat generator. If nec-
essary, reset the appliance.
Check flue gas damper connection
at EM-EA1 extension (DIO elec-
tronics module).
Reset device.
Check solenoid valve connection
at EM-EA1 extension (DIO elec-
tronics module).
Reset device.
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 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 device.