Viessmann Vitoplus 300 Service Instructions Manual page 75

Fault codes
(cont.)
Display fault System char-
code acteristics
FE Burner
blocked
FF Burner
blocked
Repairs
Checking the outside temperature sensor
Cause
Strong interference
(EMC) field nearby or
boiler coding card/main
PCB faulty
Internal fault
1. Pull plug "X3" from the control unit.
Troubleshooting
Measures
Remove EMC in-
terference. If
equipment will not
restart, check
boiler coding card
and replace it or
the control unit.
Remove EMC in-
terference. If
equipment will not
restart, check
boiler coding card
and replace it or
the control unit.
75