Troubleshooting Diagnosis; Faults With Flash Code Indication - Viessmann Vitoflame 300 VHG III Service Instructions Manual

Troubleshooting
Diagnosis

Faults with flash code indication

Fault
Burner does not start (with
fault indication), indicator il-
luminates
Burner does not start (with
fault indication)
Burner starts, but no flame
is formed
Pump does not supply oil
Burner starts, but no oil is
injected
External light during the
pre-purge phase
18
Red flash Cause of fault
code
10 x Wiring fault or internal burner
fault; not all consumers were rec-
ognised; other error
2 Motor faulty
×
2 Coupling between motor and oil
×
pump faulty
2 Oil pump seized up or sluggish
×
6 Servomotor faulty
×
2 Ignition electrodes incorrectly ad-
×
justed
2 Ignition electrodes damp and
×
contaminated
2 Insulation body of ignition electro-
×
des cracked
2 Ignition transformer faulty
×
2 Ignition cable faulty
×
2 Pump does not supply oil
×
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 filter bowl
×
2 Oil flow and return hoses inter-
×
changed
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 incorrectly ad-
×
justed or worn
Action
Check the electrical connection
Replace motor
Replace coupling
Clean the oil pump, or replace if
necessary
Replace the servomotor
Set correctly (see chapter
"Checking and adjusting the igni-
tion electrodes")
Clean ignition electrode block
Replace ignition electrode block
Replace ignition transformer
Replace ignition cable
Mount pressure and vacuum
gauges at the pump and check
build-up of pressure (see follow-
ing paragraph)
Open valves
Clean filter (pre-filter and pump
filter), replace if necessary
Replace coupling
Retighten fittings. Check the oil
lines for leaks; seal if necessary.
Connect correctly acc. to mark-
ings on pump
Check sizing of oil line cross-sec-
tion. Replace filter. Check the ex-
ternal oil valve.
Check external oil valve and re-
place if required
Replace solenoid valve coil
Replace oil pump
Replace nozzle
Replace oil pump
Replace flame monitor
Check the ignition electrodes; re-
place if necessary