Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 132

Fault rectification
Fault codes
(cont.)
Fault code dis- System characteristics
played
A4 Burner blocked
A5 Burner blocked
A6 Burner blocked
AA Burner blocked
AB Burner blocked
AC Burner blocked
B4 Control mode
BD Burner blocked
BE Burner blocked
C8 Burner blocked
132
Cause
Fault, material shortage
Fault, material shortage
due to time-out: The
blocking time set for the
vacuum module is too
long.
Ash box full
Boiler had excess temper-
ature.
Water pressure is too low.
Water pressure is too
high.
Fuel store empty
Maintenance cover/door
of fuel store open
Discharge transfer conta-
minated
Changeover unit has not
reached position.
Measures
Check fuel store fill level
■
For 8 and 12 kW – manual
■
charging: Check the fill level of
the day hopper.
For 18 to 48 kW – pellet supply
■
with vacuum system: Check the
output stage of the vacuum mod-
ule. If required, set a higher out-
put stage at the vacuum module.
Installation and service in-
structions, vacuum module
Adjust the vacuum module block-
ing time in the control unit.
Note
The fault is deleted after the block-
ing time and the boiler is started.
Empty the ash box
■
Acknowledging fault
■
Note
The ash box fill level can be reset
as follows:
1. Key å
2. | / ~ to select.
3. Confirm "Information" with d .
4. | / ~ to select.
5. Confirm "Reset data" with d .
Check set values in control unit
■
Check pump
■
Check valves
■
Check the sensors
■
Note
For resetting the high limit safety
cut-out (STB), see Cancelling the
function in chapter "Maintenance,
high limit safety cut-out (STB)".
Check for water shortage and wa-
ter pressure.
Check water pressure.
Check fuel store fill level.
Check maintenance cover/door of
fuel store.
Clean proximity switch.
Test changeover unit.