Shizuoka Seiki VAL6 KBE5S, Service Manual

VAL6 KBE5S  Trouble Shooting

Possible Cause

How to check

Result

Remedy

Reference

Phenomenon

Misfire lamp
is lit.

Loose flame
monitor

Open burner cover, and
check if the flame
monitor is in

If flame monitor comes
off, it doesn't work

Put in flame
monitor firmly

Shortage of  light
sensed from flame

Take flame monitor out,
and check condition of
its lens

If photorecepter is dirty,
sensor becomes less
sensitive.

Clean the sensor
with soft cloth

Remove burner, and
then check clarity of
draft tube and vane

If draft tube or fan is
dirty, it senses little light

Clean draft tube
and whirl vane

Picture 8

Check extent of
combustion air inlet
opening

If opening is too wide,
flame is short because
combustion air is too
much

Decrease opening
to reduce
combustion air.
Normal scale: 3

Loose connection
of flame monitor

Plug flame monitor
connector (CN 11)
again, and then turn on

If it works normally,
flame monitor connector
fails on contact

Plug connector
(CN 11) firmly

Failure of flame
monitor

Unplug flame monitor
connector (CN 11), and
then check transition of
resistance by changing
quantity of light into
flame monitor

If resistance doesn't
change, flame monitor
fails

Replace flame
monitor

Nozzle clogged

Replace nozzle

If it ignited, nozzle is
clogged

Replace nozzle

Filter clogged

Check clarity of filter

If filter is dirty, fuel
flow decreases because
of filter clogged

Replace filter

3

．

Misfire

within 25
seconds after
ignition.

5