Viessmann VEK, Service Instructions Manual

Page: 24 / 44

24
Troubleshooting
Diagnosis (burner control unit LMO14. ...)
(cont.)
Fault/
characteristics Flashing
code
red at
LMO14 Cause Remedy
Burner starts
and flame is
f
d b t
2× Flame monitor
contaminated Clean flame monitor
a d a e s
formed, but
burner cuts
out after safety
2× Flame monitor receives
insufficient light Clean sensor plate
out after safety
time expires
2× Flame monitor faulty Replace flame monitor
2× Burner control unit faulty Replace burner control
unit
2× Carbon deposits on
flame tube or on sensor
plate Clean flame tube and
sensor plate
Flame
ti i h
7× Air in suction line Seal line and filter
extinguishes
during
7× Nozzle faulty Nozzle replacement
during
operation
7× Burner incorrectly
adjusted Adjust pre−settings
correctly (see page36)
7× Sensor plate
contaminated Clean sensor plate
Ignition
switches ON
d
i
7× Flame monitor
contaminated Clean flame monitor
s tc es O
during
operation
7× Sensor plate
contaminated Clean sensor plate
7× Nozzle contaminated or
faulty Nozzle replacement
Flame pulsates Fan pressure too high Check static burner
pressure via test nipple
on top of fan housing
(U−shaped pressure
gauge). Adjust air
damper or blast tube
connection so that lower
static burner pressure
(see standard values for
burner adjustment,
page36) is not
exceeded.
Oil consumption too
high Adjust oil pressure
correctly (see page36)
5692589GB