88
Displayed fault
code
System characteristics Cause Measures
F.377 Burner in a fault state Post-processing ionisation
current calibration: Stabili-
sation conditions for post-
calibration not reached
Check gas type setting. If fault re-
curs, replace BCU burner control
unit: See page 100.
Reset the appliance.
F.378 Burner in a fault state Flame loss during stabili-
sation or operating phase
■
Check gas supply (gas pressure
and gas flow switch).
■
Check flue gas recirculation.
■
Check for contamination of ioni-
sation electrode and burner
gauze assembly.
Reset the appliance.
F.379 Burner in a fault state Flame signal not present
or insufficient
■
Check ionisation electrode con-
necting cable for damage and
ensure it is secure.
■
Check ionisation electrode, re-
place if necessary.
Reset the appliance.
F.380 Burner in a fault state Flame is lost immediately
after flame formation (dur-
ing safety time)
Check gas supply (gas pressure
and gas flow switch).
Check balanced flue system for
flue gas recirculation.
Check ionisation electrode, burner
gauze assembly:
■
Clearance to burner gauze as-
sembly
■
Contamination on electrode
Reset the appliance.
F.381 Burner in a fault state Flame loss during operat-
ing phase
Check gas supply (gas pressure
and gas flow switch).
Check balanced flue system for
flue gas recirculation.
Check ionisation electrode, burner
gauze assembly:
■
Clearance to burner gauze as-
sembly.
■
Contamination on electrode
Reset the appliance.
F.382 Burner in a fault state Fault counter has excee-
ded limit.
Reset the appliance. Work through
fault analysis using fault history.
F.383 Burner in a fault state Possible contamination of
gas line
■
Check gas line for contamination.
■
Check the gas supply pressure.
■
Replace gas fan if required.
Reset the appliance.
F.384 Burner in a fault state Possible contamination of
gas line
■
Check gas line for contamination.
■
Check the gas supply pressure.
■
Replace gas fan if required.
Reset the appliance.
F.385 Burner in a fault state Short circuit, signal 1, ioni-
sation current.
BCU burner control unit
faulty.
Check IO electrode for earth fault.
If fault persists, replace BCU burn-
er control unit: See page 100.
Reset the appliance.
Troubleshooting
Fault messages (cont.)
6151778
Service
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