Viessmann Vitoligno 300-C Installation And Service Instructions Manual page 111

Fault codes
(cont.)
Displayed fault System characteristics
code
D6 Warning
D8 Warning
E0 Burner locked out
F7 Burner locked out
F8 Burner locked out
F9 Burner locked out
FA Burner locked out
FF Boiler output deviating
Cause
The silo may not be full
enough
CAN bus interruption
Jumpers are not inserted
in slots 97 and 98
Heat exchanger cleaning
did not reach limit position
Ash removal screw con-
veyor has gone into re-
verse too often
Grate did not reach limit
position
Proximity switch in pellet
hopper is constantly dirty
Program memory error
Troubleshooting
Measures
Check the silo fill level
Check fuses
■
Check wiring
■
Check jumpers and insert if neces-
sary
Check the limit switch for heat
■
exchanger cleaning
Check heat exchanger cleaning
■
Check ash removal screw convey-
or and ash box
Acknowledge a fault
■
If fault recurs, check grate
■
Clean grate if necessary
■
Clean proximity switch
Check boiler type in the control unit
111