Viessmann B0KA Installation And Service Instructions Manual page 66

Troubleshooting
Fault messages
(cont.)
Displayed fault System characteristics
code
380 Burner in a fault state
381 Burner in a fault state
382 Burner in a fault state
383, 384 Burner in a fault state
385 Burner in a fault state
386 Burner in a fault state
387 Burner in a fault state
388 Burner in a fault state
395 Burner in a fault state
66
Cause
Flame is lost immediately
after flame formation (dur-
ing safety time)
Flame loss during operat-
ing phase
Fault counter has excee-
ded limit.
Possible contamination of
gas line
Short circuit, signal 1, ioni-
sation current
HBMU heat management
unit faulty
HBMU heat management
unit faulty
Earth fault, ionisation cur-
rent. HBMU heat manage-
ment unit faulty.
HBMU heat management
unit faulty
IO electrode earth fault,
HBMU heat management
unit faulty
Measures
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.
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.
Reset the appliance. Work through
fault analysis using fault history.
Check gas line for contamination.
■
Check the gas supply pressure.
■
Replace gas fan if required.
■
Reset the appliance.
Check IO electrode for earth fault.
If the fault persists, replace the
HBMU heat management unit.
Reset the appliance.
Replace the HBMU heat manage-
ment unit. See chapter "Replacing
the HBMU heat management unit".
Reset the appliance.
Check ionisation electrode and
connecting cable. If the fault per-
sists, replace the HBMU heat man-
agement unit. See chapter "Re-
placing the HBMU heat manage-
ment unit".
Reset the appliance.
Replace the HBMU heat manage-
ment unit. See chapter "Replacing
the HBMU heat management unit".
Reset the appliance.
Check ignition electrode for earth
fault. If the fault persists, replace
the HBMU heat management unit.
Reset the appliance.