Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 133

Fault codes
(cont.)
Fault code dis- System characteristics
played
C9 No fuel transport
E0 Burner blocked
F7 *9 Heat exchanger cleaning not
working.
F9 Burner blocked
FA Burner blocked
FF Boiler output deviating
Fault message only for Vitoligno 300-C 18-48 kW boilers.
*9
Cause
Vacuum module in contin-
uous operation for too
long.
Jumpers at slots 97 and
98 not fitted.
The limit switch for heat
exchanger cleaning is not
switching.
Grate did not reach end
position.
Proximity switch in pellet
hopper is constantly con-
taminated.
Program memory error.
Check boiler type in the
control unit.
Fault rectification
Measures
Check suctions lines for block-
■
ages and remove if necessary.
Ensure sufficient fuel in fuel
■
store.
Notify heating contractor.
Notify heating contractor.
Acknowledge fault.
■
If fault recurs, check grate.
■
Clean the grate if necessary.
■
Clean proximity switch.
Notify heating contractor.
133