85
Fault number
on the display
System characteristics
Cause
Measures
F.455
Burner in a fault state
Error in logical program
run monitoring
Reset the appliance.
F.456
Burner in a fault state
System status at system
start
Reset the appliance.
F.457
Burner in a fault state
Fan blocked
Check free movement of the impel-
ler. Replace the fan unit if required.
Reset the appliance.
F.458
Burner locked out
Internal error
Restart the heat generator. If nec-
essary, reset the appliance.
F.461
Burner in a fault state
Feedback signal of flue
gas damper connection at
EM-EA1 extension input
(DIO electronics module)
preventing burner start.
Check flue gas damper connection
at EM-EA1 extension (DIO elec-
tronics module).
Reset the appliance.
F.462
Burner in a fault state
LPG safety valve (sole-
noid valve) at EM-EA1 ex-
tension does not open
(DIO electronics module).
Check solenoid valve connection
at EM-EA1 extension (DIO elec-
tronics module).
Reset the appliance.
F.463
Burner in a fault state
Ionisation current too low
during calibration
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.
Troubleshooting
Fault messages
(cont.)
6130884
Service