101
5790 980 - 04
Vitoligno 300-C Installation/Service
Troubleshooting
Fault Display
(continued)
Fault codes
Fault code displayed
System characteristics
Cause
Measures
A6
Burner blocked
Ash box full or secondary
heating surface cleaning
blocked
Emptying the ash box
Acknowledging a fault
If the fault recurs:
Check the mechanism for
secondary heating surface
cleaning and the ease of
operation of the
turbulators. See chapters
“Cleaning secondary
heating surfaces” and
“Cleaning the ash chamber
and ash removal parts”.
AA
Burner blocked
Boiler had excess
temperature.
Check set values in
control unit
Check pump
Check valves
Check sensors
AB
Burner blocked
Water pressure is too low.
Check low water cutoff
connections (see safety
equipment connections
on page 43)
Check jumper cable
connections (see auxiliary
safety equipment
connections page 43)
AC
Burner blocked
Water pressure is too high.
Check water pressure.
B4
Control mode
Fuel store empty
Check fuel store fill level.
BD
Burner blocked
Maintenance cover/door
of fuel store open
Check jumper cable
connections (see system
limit switch page 49)
BE
Burner blocked
Discharge transfer
contaminated
Clean proximity switch.
C8
Burner blocked
Changeover unit has not
reached position.
Test the changeover unit.
C9
No fuel transport
Vacuum module spends too
long in constant operation.
Check suction lines for
blockages and remove if
necessary.
Ensure there is sufficient
fuel in the fuel store.
E0
Burner blocked
Jumpers are not inserted
in slots 97 and 98.
Notify heating contractor.
F9
Burner blocked
Grate did not reach limit
position.
Acknowledge a fault
If fault recurs, check grate
Clean grate if required
FA
Burner blocked
Proximity switch in pellet
hopper is constantly
contaminated.
Clean proximity switch.
