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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Fault Messages
(continued)
Troubleshooting
Displayed
fault code
System characteristics Cause
Measures
F.395
Burner in a fault state
IO electrode ground
fault, BCU burner
control unit faulty
Check ignition electrode for ground fault.
If fault persists, replace BCU burner control unit:
See page 89.
Reset the boiler.
F.396
Burner in a fault state
BCU burner control
unit faulty
Replace BCU burner control unit:
See page 89.
Reset the boiler.
F.399
Burner in a fault state
IO electrode ground
fault, BCU burner
control unit faulty
Check IO electrode for ground fault.
If fault persists, replace BCU burner control unit:
See page 89.
Reset the boiler.
F.400
Burner in a fault state
BCU burner control
unit faulty
Replace BCU burner control unit:
See page 89.
Reset the boiler.
F.401
Burner in a fault state
IO electrode ground
fault, BCU burner
control unit faulty
Check IO electrode for ground fault. If fault persists,
replace BCU burner control unit:
See page 89.
Reset the boiler.
F.402
Burner in a fault state
BCU burner control
unit faulty
Replace BCU burner control unit:
See page 89.
Reset the boiler.
F.403
Burner in a fault state
Ionization electrode
ground fault, BCU
burner control unit
faulty
Check IO electrode for ground fault. If fault persists,
replace BCU burner control unit:
See page 89.
Reset the boiler.
F.404
Burner in a fault state
BCU burner control
unit faulty
Replace BCU burner control unit:
See page 89.
Reset the boiler.
F.405
Burner in a fault state
Ionization electrode
ground fault, BCU
burner control unit
faulty
Check IO electrode for ground fault. If fault persists,
replace BCU burner control unit:
See page 89.
Reset the boiler.
F.406,
F.408,
F.410
Burner in a fault state
BCU burner control
unit faulty
Replace BCU burner control unit:
See page 89.
Reset the boiler.
F.416
Burner locked out
Flue gas temperature
sensor incorrectly
positioned
Fit flue gas temperature sensor correctly.
See “Repairs”.
Carry out mains reset after fault has been remedied.
F.417,
F.418
Burner in a fault state
BCU burner control
unit faulty
Replace BCU burner control unit:
See page 89.
Reset the boiler.
F.425
System operating
normally; calculation
not working
Time synchronization
failed
Set the time. If external time is used, check parameters
1504 and 508.
F.430
Normal operation in
line with target values
of boiler
Communication error
gateway
Check gateway module connecting cable and
power supply.
F.446
Burner in a fault state
Deviation, boiler supply
temperature sensor/
high limit safety cutout
Check the supply temperature sensor/high limit safety
cut-out.
Check plug-in connection and lead to sensor.
Reset the boiler.
