Viessmann FB2B Installation And Service Instructions Manual page 113

Fault codes
(cont.)
Displayed System characteris-
fault code tics
Fd Burner in a fault
state
FE Burner blocked or in a
fault state
FF Burner blocked or in a
fault state
Cause Measures
Fault, burner con- Check ignition electrodes
trol unit and connecting cables.
Check whether a strong
interference (EMC) field
exists near the appliance.
Press reset button R.
Replace control unit if the
fault persists.
Boiler coding card Press reset button R.
or main PCB faulty Replace boiler coding
card or control unit if the
fault persists.
Internal fault or Start the appliance again.
reset button R Replace the control unit if
blocked the appliance will not
restart.
Troubleshooting
113