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
