Viessmann Vitoflame 200 Service Instructions Manual page 19

Diagnostics
(cont.)
Fault/system Flashing
behaviour code red
at LMO 14
Pump does 2 ×
not supply oil
2 ×
2 ×
2 ×
2 ×
2 ×
2 ×
2 ×
Burner starts, ,
b but no oil il
2 ×
injected injected
2 ×
4 ×
Extraneous
light during
pre−purge pre purge
4 ×
phase
4 ×
Cause
Shut−off valves closed
at filter or in oil pipe
Filter blocked
Coupling between
motor and pump faulty
Leak in suction line or
filter cup
Oil flow and return
hoses interchanged
Vacuum in suction line
too high (higher than
0.35 bar)
External oil valve faulty
Solenoid coil faulty
Oil pump faulty
Nozzle blocked
Oil pump solenoid
valve fails to close
Flame monitor faulty
Ignition electrodes
poorly adjusted or worn
Troubleshooting
Remedy
Open valves
Clean filter (pre−filter
and pump filter) or
replace if required
Replace coupling
Tighten connections.
Check oil pipes and
connections for leaks
and tighten if
necessary.
Connect correctly acc.
to instructions on
pump
Check size of oil pipe
cross−section.
Replace filter. Check
external oil valve.
Check and, if necessary,
replace external fuel oil
valve
Replace solenoid coil
Replace oil pump
Replace nozzle
Replace oil pump
Replace flame monitor
Check ignition
electrodes and replace
if necessary
19