Viessmann B0KA Installation And Service Instructions Manual page 64

Troubleshooting
Fault messages
(cont.)
Displayed fault System characteristics
code
359 Burner in a fault state
361 Burner in a fault state
365 Burner in a fault state
366, 367 Burner in a fault state
369 Burner in a fault state
370 Burner in a fault state
64
Cause
No ignition spark
Flame signal is not
present or insufficient at
burner start.
Gas valve relay contact
feedback implausible (re-
lay contact is "welded up")
Gas valve electricity sup-
ply does not turn off.
Flame is lost immediately
after flame formation (dur-
ing safety time)
Gas valve or modulation
valve will not close.
Measures
Check whether the ignition elec-
■
trode insulation is damaged.
Check for a voltage of 230 V∼ at
■
the ignition module during the ig-
nition phase. If not, replace the
HBMU heat management unit.
If 230 V~ is present at the igni-
■
tion module but there is still a
fault, replace the ignition module.
Check connection cables and
■
leads from ignition module and
ignition electrode.
Reset the appliance.
Check ionisation electrode and
connecting cable. Check plug-in
connections for loose contacts.
Note
Deposits on the electrodes indicate
foreign bodies in the combustion
air. Check the installation room and
flue system for causes of the de-
posits. For example: Laundry de-
tergents, cleaning agents, toilet-
ries, deposits in the ventilation air
supply (chimney)
Reset the appliance.
Replace the HBMU heat manage-
ment unit.
Replace the HBMU heat manage-
ment unit. See chapter "Replacing
the HBMU heat management unit".
Check gas supply (gas pressure
and gas flow switch).
Check balanced flue system for
flue gas recirculation.
Check ionisation electrode for the
following:
Clearance to burner gauze as-
■
sembly
Contamination on electrode
■
Reset the appliance.
Reset the appliance.
If fault occurs repeatedly, replace
fan unit.