Viessmann B2TF Installation And Service Instructions Manual page 89

Fault messages
(cont.)
Displayed fault System characteristics
code
F.386 Burner in a fault state
F.387 Burner in a fault state
F.388 Burner in a fault state
F.395 Burner in a fault state
F.396 Burner in a fault state
F.399 Burner in a fault state
F.400 Burner in a fault state
F.401 Burner in a fault state
F.402 Burner in a fault state
F.403 Burner in a fault state
F.404 Burner in a fault state
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
Cause
BCU burner control unit
faulty
Earth fault, ionisation cur-
rent. BCU burner control
unit faulty.
BCU burner control unit
faulty
IO electrode earth fault,
BCU burner control unit
faulty
BCU burner control unit
faulty
IO electrode earth fault,
BCU burner control unit
faulty
BCU burner control unit
faulty
IO electrode earth fault,
BCU burner control unit
faulty
BCU burner control unit
faulty
Ionisation electrode earth
fault, BCU burner control
unit faulty
BCU burner control unit
faulty
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
Troubleshooting
Measures
Replace BCU burner control unit:
See page 100.
Reset the appliance.
Check ionisation electrode and
connecting cable. If fault persists,
replace BCU burner control unit:
See page 100.
Reset the appliance.
Replace BCU burner control unit:
See page 100.
Reset the appliance.
Check ignition electrode for earth
fault. If fault persists, replace BCU
burner control unit: See page 100.
Reset the appliance.
Replace BCU burner control unit:
See page 100.
Reset the appliance.
Check IO electrode for earth fault.
If fault persists, replace BCU burn-
er control unit: See page 100.
Reset the appliance.
Replace BCU burner control unit:
See page 100.
Reset the appliance.
Check IO electrode for earth fault.
If fault persists, replace BCU burn-
er control unit: See page 100.
Reset the appliance.
Replace BCU burner control unit:
See page 100.
Reset the appliance.
Check IO electrode for earth fault.
If fault persists, replace BCU burn-
er control unit: See page 100.
Reset the appliance.
Replace BCU burner control unit:
See page 100.
Reset the appliance.
Check IO electrode for earth fault.
If fault persists, replace BCU burn-
er control unit: See page 100.
Reset the appliance.
Replace BCU burner control unit:
See page 100.
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 100.
Reset the appliance.
89