Viessmann VITOSOL 200, Service Instructions Manual

Page: 20 / 28

Troubleshooting
20
Diagnosis
(cont.)
Fault/system characteristics Flashing code
red
at LMO14 Cause of fault Check
Burner starts up, but no oil
injected
2× flashes
DD
Solenoid coil faulty Replace solenoid coil
j
2× flashes
DD
Oil pump faulty Replace oil pump
2× flashes
DD
Nozzle blocked Replace nozzle
Extraneous light during
pre−purge phase 4× flashes
DDDD
Oil pump solenoid valve
fails to close Replace oil pump
p p g p
4× flashes
DDDD
Flame monitor faulty Replace flame monitor
4× flashes
DDDD
Ignition electrodes
incorrectly adjusted or
worn Check ignition electrodes and replace, if
necessary
Burner starts up and flame is
formed, but burner cuts out
2× flashes
DD
Flame monitor
contaminated Clean flame monitor
,
after safety time expires
2× flashes
DD
Flame monitor receives
insufficient light Clean sensor plate
2× flashes
DD
Flame monitor faulty Replace flame monitor
2× flashes
DD
Burner control unit faulty Replace burner control unit
2× flashes
DD
Carbon deposits on flame
tube or on sensor plate Clean flame tube
Flame extinguishes during
operation 7× flashes
DDDDDDD
Air in suction line Seal line and filter
p
7× flashes
DDDDDDD
Nozzle faulty Nozzle replacement
7× flashes
DDDDDDD
Burner incorrectly
adjusted Re−instate factory pre−set values
(see page22)
7× flashes
DDDDDDD
Sensor plate
contaminated Clean sensor plate
Ignition switches on during
operation 7× flashes
DDDDDDD
Flame monitor
contaminated Clean flame monitor
7× flashes
DDDDDDD
Sensor plate
contaminated Clean sensor plate
7× flashes
DDDDDDD
Nozzle contaminated or
faulty Nozzle replacement
Flame pulsates Fan pressure too high Check fan pressure via test nipple on top
of fan housing (U−shaped pressure
gauge). Set air damper or blast tube
connection, so that lower value of static
burner pressure (see Standard values
for burner setting", page22) will not be
exceeded
Oil consumption too high Correctly adjust oil pressure
(see page22)
5692452 GB