Viessmann VITODENS 200-W Installation And Service Instructions For Contractors page 98

Troubleshooting
Fault messages
(cont.)
Displayed fault System characteristics
code
F.405 Burner in a fault state
F.406, F.408, Burner in a fault state
F.410
F.416 Burner locked out
F.417, F.418 Burner in a fault state
F.425 System in control mode, cal-
culation out of operation
F.430 Control mode operation in
line with set values of heat
generator
F.446 Burner in a fault state
F.447, F.448 Burner in a fault state
F.449, F.450, Burner in a fault state
F.451, F.452
F.453 Burner in a fault state
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 locked out
F.462 Burner in a fault state
98
Cause
Ionisation electrode earth
fault, BCU burner control
unit faulty
BCU burner control unit
faulty
Flue gas temperature sen-
sor incorrectly positioned
BCU burner control unit
faulty
Time synchronisation
failed
Communication error,
gateway
Deviation, heat generator
flow temperature sensor/
high limit safety cut-out
Deviation, ionisation volt-
age signal
Error in scheduled pro-
gram run monitoring
Synchronisation error, se-
quence
Incorrect software version
Error in program run moni-
toring
Error in program run moni-
toring
Fan sluggish or blocked.
Internal error
LPG safety valve (sole-
noid valve) at EM-EA1 ex-
tension does not open
(DIO electronics module).
Measures
Check IO electrode for earth fault.
If fault continues to persist, replace
BCU burner control unit (see
page 109).
Reset the appliance.
Replace BCU burner control unit
(see page 109).
Reset the appliance.
Fit flue gas temperature sensor
correctly. See "Repairs".
Carry out mains reset after fault
has been remedied.
Replace BCU burner control unit
(see page 109).
Reset the appliance.
Set the time. If external time is
used, check parameters 1504 and
508.
Check gateway module connecting
cable and power supply.
Check the flow temperature sen-
sor/high limit safety cut-out.
Check plug-in connection and lead
to sensor.
Reset the appliance.
Replace BCU burner control unit
(see page 109).
Reset the appliance.
Reset the appliance. If fault recurs,
replace BCU burner control unit
(see page 109).
Reset the appliance. If fault recurs,
replace BCU burner control unit
(see page 109).
Flash the correct software version
for the BCU burner control unit.
Reset the appliance. If fault recurs,
replace BCU burner control unit
(see page 109).
Reset the appliance. If fault recurs,
replace BCU burner control unit
(see page 109).
Reset the appliance.
Check fan for sluggishness. In the
case of severe contamination or
grinding noises, replace fan unit.
Restart the heat generator. If nec-
essary, reset the appliance.
Check solenoid valve connection
at EM-EA1 extension (DIO elec-
tronics module).
Reset the appliance.