Viessmann Vitoflame 100 Service Instructions Manual page 25

Diagnosis
(cont.)
Fault
Pump does not sup-
ply oil
Burner starts, but no
oil is injected
Extraneous light
during the pre-
purge phase
Red Cause
flashing
code
2 × Shut-off valves closed at
filter or in oil line
2 × Filter blocked
2 × Coupling between motor
and pump faulty
2 × Leak in suction line or fil-
ter bowl
2 × Oil flow and return hoses
interchanged
2 × Vacuum in suction line
too high (above
0.35 bar)
2 × External oil valve faulty
2 × Solenoid valve coil
faulty
2 × Oil pump faulty
2 × Nozzle blocked
4 × Oil pump solenoid valve
fails to close
4 × Flame monitor faulty
4 × Ignition electrodes badly
adjusted or worn
Troubleshooting
Measures
Open valves
Clean filter (pre-filter and
pump filter), replace if
required
Replace coupling
Tighten connections.
Check oil lines and con-
nections for leaks, and
tighten if required.
Connect correctly
according to instructions
on pump
Check cross-section of
oil lines. Replace filter.
Check the external oil
valve.
Check external oil valve
and replace if required
Replace solenoid valve
coil
Replace oil pump
Replace nozzle
Replace oil pump
Replace flame monitor
Check ignition electro-
des and replace if
required
25