22
If
the
l
ight-re
c
eiving
surfa
c
e(sensing
surfa
c
e)
gets
darkened
with
soot,
the
bad
sensitivity
c
ause
the
wrong
automati
c
operation.
Cleaning
the
flame
detector
You
c
an
pu
ll
out
the
flame
dete
c
tor(b
l
a
c
k)
whi
c
h
is
atta
c
hed
in
the
l
ower
part
of
the
burner.
Wipe
the
g
l
assy
surfa
c
e
of
the
flame
dete
c
tor
with
a
s
c
rap
and
fix
it
in
its
opposition.
At
l
east
on
c
e
a
year,
c
he
c
k
for
any
l
oose
joints
in
the
dis
c
harge(piping
and
flue),
cl
ogging
in
flue,
c
orrosion
or
l
eak.
If
any
abnorma
l
ity
is
found,
c
onta
c
t
out
sa
l
es
agen
c
y
for
c
he
c
king
up.(b
l
o
c
king
pipes
or
ho
l
es,
and
so
on)
Checking
the
exhaust
p
i
p
e
Summary of Contents for KDB-203 STC
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