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3.
A
fl
am
e i
gni
tes
on
the
bu
rne
r,
bu
ti
tgo
es
ou
tim
m
edi
at
el
y:
W
ire c
ol
or
C
he
ck
the
fl
am
e r
od
1
BL
-
Bu
rne
rca
se
G
ND
10
kH
z -
100
kH
z
C
he
ck
the
c
ur
ren
t f
rom
the
fl
am
e r
od
1
BL
-
Ele
ct
rod
e
Fl
am
e
R
od
DC 1
μ
A o
r m
ore
C
he
ck
for
a di
conn
ec
ted
gr
oun
d f
rom
the
ci
rcu
it
boa
rd
C
he
ck
for
da
m
age
or
im
pr
ope
r c
onn
ec
tion
o
f t
he
gr
oun
d wi
re
be
tw
een
the
c
irc
uit
boar
d
and
the
m
et
al
c
as
e o
f t
he
un
it.
C
he
ck
ga
s s
upp
ly
and
m
an
ifol
d pr
ess
ur
es
C
he
ck
ga
s pr
op
or
tion
ing
va
lve
CN
10
1
7
R - BL
6
CN
10
1
DC
0.
3 -
15
V
Cu
rr
en
tv
al
ue
c
han
ge
s
depe
ndi
ng
on
the
load
.
Pr
opo
rti
on
ing
v
al
ue
re
sis
tan
ce:
5
0
-80
4. F
lam
e
goe
s
ou
t w
hil
e
ho
tw
at
er
is
be
ing
s
upp
lied
:
W
ire c
ol
or
C
he
ck
the
fl
am
e r
od
1
BL
-
Bu
rne
rca
se
G
ND
10
kH
z -
100
kH
z
C
he
ck
the
c
ur
ren
t f
rom
the
fl
am
e r
od
1
BL
-
Ele
ct
rod
e
Fl
am
e
R
od
DC 1
μ
A o
r m
ore
C
he
ck
for
a di
conn
ec
ted
gr
ou
nd
fr
om
the
ci
rcu
it
boa
rd
C
he
ck
for
da
m
age
or
im
pr
op
er
c
onn
ec
tion
o
ft
he
gr
ou
nd
wi
re
be
tw
een
the
c
irc
uit
boar
d
and
the
m
et
al
c
as
e o
ft
he
un
it.
C
he
ck
ga
s s
ol
en
oi
d v
al
ve -
1
CN1
0
9
BK - BL
6
CN1
0
DC
14
- 1
6 V
G
as
S
ol
en
oi
d V
al
ve
ty
pi
cal
res
is
tan
ce
:36
-
58
C
he
ck
ga
s s
ol
en
oi
d v
al
ve -
2
CN
10
8
G
Y - BL
6
CN1
0
DC
14
- 1
6
V
G
as
S
ol
en
oi
d V
al
ve
ty
pi
cal
res
is
tan
ce
:36
-
58
C
he
ck
ga
s s
upp
ly
and
m
an
ifol
d pr
ess
ur
es
C
he
ck
ga
s pr
op
or
tion
ing
va
lve
CN
10
1
7
R - BL
6
CN
10
1
DC
0.
3 -
15
V
Cu
rr
en
tv
al
ue
c
han
ge
s
depe
ndi
ng
on
the
load
.
Pr
op
or
tion
ing
v
al
ue
res
is
tan
ce
:50
-
80
29
C
ond
en
sat
e D
ar
in
T
rap
(W
at
er
Lev
el
E
lec
trod
e)
abn
or
m
ali
ty
C
he
ck
m
ai
nt
ena
nc
e m
on
ito
r No
.19
O
FF
[000
]
If
N
o.
19
is
O
N
[00
1],
c
he
ck
the
fo
llow
ing
:
C
he
ck
for
C
onde
ns
at
e D
ar
in
T
rap
bl
oc
kag
e.
C
he
ck
for
dr
ai
n pi
pe
bl
oc
kag
e.
C
he
ck
for
pr
op
er
c
on
ne
cti
on
o
fC
ond
en
sat
e D
ar
in
T
rap
w
at
er
lev
el
el
ec
trode
.
C
he
ck
for
s
ho
rt
ci
rcu
it
of
C
ond
en
sat
e D
ar
in
T
rap
w
at
er
le
vel
el
ec
trode
c
or
d.
If
no
rm
al
v
al
ue
,r
epl
ac
e t
he
c
irc
ui
tboa
rd.
35
Ex
hau
st T
he
rm
is
to
r A
bno
rm
ali
ty
C
he
ck
the
re
si
st
an
ce
thr
oug
h t
he
the
rm
is
to
r.
C
he
ck
for
ope
n or
s
ho
rt
ci
rc
ui
t,or
im
pr
op
er
conn
ec
tion
.
CN6
3
7
W
- W
2
CN6
3
C
om
pa
re
to
tem
pe
rat
ur
e c
ha
ra
ct
er
ist
ic
lis
t(**).
C
he
ck
for
ope
n or
s
ho
rt
ci
rc
ui
tor
for
an
im
pr
ope
r c
on
ne
cti
on
.
C
he
ck
the
re
si
st
an
ce
thr
ou
gh
the
ther
m
is
tor
C
he
ck
for
abn
or
m
al
c
om
bu
sti
on
.
C
he
ck
fl
ue
for
bl
oc
kag
e or
ob
st
ruc
tion
.
R
ef
er
to "
M
ani
fol
d
P
res
sur
e A
dj
us
tm
en
tPro
cedur
e"
-
-
V
is
ua
lly c
on
fir
m
tha
ta
fl
am
e i
gni
tes
,c
he
ck
wi
ring
c
onn
ec
tion
s t
o f
lam
e r
od
,an
d
che
ck
wi
ring
c
onn
ec
tion
s t
o
ga
s pr
op
or
tion
ing
and
ga
s s
ol
eno
id v
al
ves
.
C
he
ck
for
a
ba
d c
ont
ac
tor
a
bad
c
onn
ec
tion
be
tw
een
fl
am
e r
od
and
c
irc
uit
boa
rd,
c
he
ck
for
a gr
oun
d f
au
lt
in
the
un
it,
es
pe
cia
lly
the
c
irc
ui
tboa
rd gr
oun
d.
Ex
hau
st T
em
pe
rat
ur
e A
bno
rm
ali
ty
94
C
he
ck
for
he
at
exc
han
ge
r pi
pe
cl
ogg
ing
.
C
he
ck
for
he
at
exc
han
ge
r f
in bl
oc
kage
.
C
he
ck
for
int
ak
e w
at
er
tem
per
at
ur
e.
(too
hi
gh?
)
CN6
3
7
W
- W
2
CN6
3
Fl
am
e R
od
T
rigger
ed
(D
oe
sn'
ts
en
se
fl
am
e
du
ring
oper
at
ion
)
G
as
S
ol
eno
id V
al
ve or
G
as
S
upp
ly
Pre
ss
ure
or
M
an
ifol
d P
res
sur
e A
bno
rm
ali
ty
12
V
is
ua
lly c
on
fir
m
tha
ta
fl
am
e i
gni
tes
,c
he
ck
wi
ring
c
onn
ec
tion
s t
o f
lam
e r
od
,an
d
che
ck w
iri
ng
c
onn
ec
tion
s t
o
ga
s pr
op
or
tion
ing
and
ga
s s
ol
eno
id v
al
ves
.
C
he
ck
for
a
bad
c
ont
ac
tor
a
ba
d c
onn
ec
tion
be
tw
een
fl
am
e r
od
and
c
irc
uit
boa
rd
,c
he
ck
for
a gr
oun
d f
au
lt
in
the
un
it,
es
pe
cia
lly
the
c
irc
ui
tboa
rd gr
oun
d.
CN7
8
Re
fer
to "
M
an
ifol
d P
res
sur
e A
dj
us
tm
en
tPro
cedur
e"
C
he
ck
poi
nt
Ci
rc
ui
tbo
ar
d C
he
ck
poi
nt
s
CN & Pi
n No
.
CN & Pi
n No
.
11
G
as
S
upp
ly
Pre
ss
ur
e or
M
an
ifol
d P
res
sur
e
A
bno
rm
ali
ty
Fl
am
e D
et
ec
ting
Ci
rc
ui
tabn
or
m
ali
ty
(in
itia
l f
lam
e f
au
lt
de
te
cti
on
)
Erro
r
C
od
e
Po
ss
ibl
e C
aus
es
Erro
r
C
od
e
Ci
rc
ui
tboa
rd C
he
ck
poi
nt
s
CN & Pi
n No
.
CN & Pi
n No
.
CN7
8
**
Exh
au
st
T
he
rm
is
to
r T
em
per
at
ur
e C
ha
ra
ct
er
is
tic
s
Tem
per
at
ur
e (
°F
)
-4
14
32
50
68
86
Tem
per
at
ur
e (
°C
)
-2
0
-1
0
0
10
20
30
R
es
ist
an
ce (
k
)
48
7
296
162
98.
3
61
.4
39.
5
Vol
tag
e (
V)
4.
6
4.
3
3.
9
3.
4
2.
8
2.
3
Po
ss
ibl
e C
aus
es
C
he
ck
poi
nt
How
to
fix
problem
and rese
tunit
How
to
fix
problem
and rese
tunit
28
Ω
Ω
Ω
Ω
Ω
Summary of Contents for EN18WI30LS
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