Diagnostics - Viessmann Vitoflame 100 Service Instructions Manual

Diagnostics

Fault code table (red fault indicator)
Fault
2 × flashes
3 × flashes
4 × flashes
5 × flashes
7 × flashes
8 ... 17 × flashes Not allocated, no fault code
18 × flashes
19 × flashes
20 × flashes
Control outputs are at zero volt during fault diagnosis; the burner remains
OFF . Exception: Fault signal at connection "S 3" (see connection and wiring
diagram from page 34).
Possible cause
The flame is not established at the end of the safety period
The air pressure switch does not close during pre−purging
Air pressure switch does not open or external light during
burner start (after 65 s)
External light during pre−purging or internal equipment
fault
Flame tears off during operation
Air pressure switch opens during pre−purging or operation
Output contact fault
Wiring fault
External voltage across output terminals
Internal equipment fault
Troubleshooting
27