Viessmann Vitoplus 300 - Repairs; Sensor and Component Checks

Display fault
code
System char-
acteristics
Cause Measures
FE Burner
blocked
Strong interference
(EMC) field nearby or
boiler coding card/main
PCB faulty
Remove EMC in-
terference. If
equipment will not
restart, check
boiler coding card
and replace it or
the control unit.
FF Burner
blocked
Internal fault Remove EMC in-
terference. If
equipment will not
restart, check
boiler coding card
and replace it or
the control unit.
Repairs
Checking the outside temperature sensor
1. Pull plug "X3" from the control unit.
Fault codes (cont.)
75
Troubleshooting
5692 536 GB