Viessmann B0KA - Page 66

66
Displayed fault
code
System characteristics Cause Measures
375 Burner restarts. Performing ionisation cur-
rent calibration: Calibra-
tion not performed. Mini-
mum value or termination
criterion not reached.
■
Check ionisation electrode and
connecting cable.
■
Check plug-in connections for
loose contacts. Check the flue
system. Remove flue gas recir-
culation if necessary.
■
Check system for condensate
backup. Visually check gas sole-
noid valve inlet and inlet strainer
for contamination.
Note
To prevent water damage, de-
tach fan unit before removing the
burner.
Deposits on the electrodes indi-
cate foreign bodies in the com-
bustion air. Check the installation
room and flue system for causes
of the deposits (e.g. laundry de-
tergents, cleaning agents, toilet-
ries or deposits in the ventilation
air supply/chimney).
If burner gauze assembly and
ionisation electrode have been
replaced, also clean fan unit,
gas/air channel and Venturi ex-
tension.
Reset the appliance.
376 Burner in a fault state Ionisation current differen-
tial compared to previous
value not plausible.
■
Check ionisation electrode and
connecting cable.
■
Check plug-in connections for
loose contacts. Check the flue
system. Remove flue gas recir-
culation if necessary.
■
Check system for condensate
backup. Visually check gas sole-
noid valve inlet and inlet strainer
for contamination.
Note
To prevent water damage, de-
tach fan unit before removing the
burner.
Deposits on the electrodes indi-
cate foreign bodies in the com-
bustion air. Check the installation
room and flue system for causes
of the deposits (e.g. laundry de-
tergents, cleaning agents, toilet-
ries or deposits in the ventilation
air supply/chimney).
If burner gauze assembly and
ionisation electrode have been
replaced, also clean fan unit,
gas/air channel and Venturi ex-
tension.
Reset the appliance.
Troubleshooting
Fault messages (cont.)
6179762
Diagnosis