74
Displayed fault
code
System characteristics Cause Measures
361 Burner in a fault state Flame signal is not
present or insufficient at
burner start.
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.
365 Burner in a fault state Gas valve relay contact
feedback implausible (re-
lay contact is "welded up")
Replace the HBMU heat manage-
ment unit.
366, 367 Burner in a fault state Gas valve electricity sup-
ply does not turn off.
Replace the HBMU heat manage-
ment unit. See chapter "Replacing
the HBMU heat management unit".
369 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 for the
following:
■
Clearance to burner gauze as-
sembly.
■
Contamination on electrode
Reset the appliance.
370 Burner in a fault state Gas valve or modulation
valve will not close.
Reset the appliance.
If fault occurs repeatedly, replace
fan unit.
Troubleshooting
Fault messages (cont.)
6167586
Diagnosis
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