Viessmann VITODENS 222-F Installation And Service Instructions Manual page 78

Troubleshooting
Fault messages
(cont.)
Fault number System characteristics
on the display
F.367 Burner in a fault state
F.368 Burner locked out
F.369 Burner in a fault state
F.370 Burner in a fault state
F.371 Burner in a fault state
78
Cause
Gas valve electricity sup-
ply does not turn off.
Gas pressure switch fault.
Forced ventilation time ex-
pired.
Flame is lost immediately
after flame formation (dur-
ing safety time).
Fuel valve or modulation
valve will not close.
Fan speed too low
Measures
Reset the appliance.
Check gas supply (gas pres-
■
sure).
If installed: Check gas pressure
■
switch for correct function.
If necessary, disconnect the gas
pressure switch connector and
check whether the burner starts.
Check gas supply (gas pressure
and gas flow switch).
Check balanced flue system for
flue gas recirculation.
Check ionisation electrode for the
following:
Distance to burner gauze assem-
■
bly (see page 43)
Contamination on electrode
■
Reset the appliance.
Check the gas train, replace if nec-
essary.
Reset the appliance.
Check the fan.
Check the fan connecting cables.
Check the fan power supply.
Reset the appliance.