90
1
1
NO
PREV
IO
US
CODE
–
S
ta
tus
c
od
es
ar
e
eras
ed
aft
e
r
7
2
h
our
s
o
r
ca
n
b
e
m
a
n
u
a
ll
y
eras
ed
b
y
pu
tti
n
g
se
tup
s
w
itc
h
S
W
1
-1
in
th
eO
N
p
o
s
it
io
na
n
d
ju
m
p
e
ri
n
g
R
,
W
/W
1
,
and
Y
/Y
2
s
im
ul
tan
e
o
u
sl
y
u
ntil
sta
tus
co
de
#
1
1
is
fl
a
s
h
e
d
.
R
un
sy
st
e
m
th
ro
u
g
h
a
mi
n
imu
m-
h
e
at
,
m
ax
im
u
m-h
ea
t,
o
r
c
o
o
li
n
g
c
y
cle
to
c
heck
s
y
st
em
.
1
2
BL
O
W
ER
O
N
AF
TER
P
O
W
ER
UP
–
(1
15
V
O
R
2
4
V
)
–
N
o
rm
a
l
op
er
a
ti
o
n
.
B
lower
ru
ns
fo
r
9
0
s
ec
on
ds,
if
u
nit
is
po
w
e
re
d
u
p
d
uri
n
g
a
c
a
ll
fo
r
h
ea
t
(R
-
W
/W
1
closed)
o
r
w
he
n
(R-
W
/W
1
opens
)
duri
ng
the
b
lo
w
e
r
o
n-
dela
y
p
erio
d.
13
L
IMI
T
C
IR
C
U
IT
LOC
K
OU
T
–
L
o
ck
out
o
ccu
rs
if
th
e
lim
it
or
flam
e
roll
o
ut
s
w
itc
h
is
ope
n
lo
ng
er
tha
n
3
m
in
ut
es
or
10
succe
ssive
lim
it
trip
s
oc
cur
re
d
d
u
ri
ng
m
a
x
im
u
m
-he
at.
C
on
trol
w
ill
a
u
to
-r
ese
t
afte
r
3
ho
ur
s.
S
e
e
c
od
e
3
3.
14
IGN
IT
ION
LOC
K
OU
T
–
S
y
s
tem
fa
ile
d
to
ignite
g
a
s
a
nd
pr
ove
fl
a
m
e
in
4
a
tt
em
pt
s.
Cont
rol
w
ill
a
u
to-
res
e
t
a
ft
er
3
h
ou
rs.
S
ee
statu
s
co
de
34
.
2
1
G
A
S
H
EATI
N
G
LO
C
K
O
U
T
–
Tu
rn
of
f
p
o
we
r
a
n
d
wa
it
5
m
in
u
te
s
to
re
tr
y.
C
h
e
c
k
for:
-
S
tuck
close
d
g
a
s
v
alve
rel
a
y
o
n
c
on
tr
ol.
-
M
is
w
ir
e
o
r
s
h
or
t
to
g
as
v
a
lve
B
LUE
w
ir
e.
2
2
ABNO
R
M
A
L
F
L
A
M
E
-P
RO
V
IN
G
S
IG
N
AL
F
la
m
e
is
p
ro
ve
d
w
h
ile
g
a
s
v
a
lve
is
d
e
-
ene
rgi
zed.
Indu
cer
w
ill
ru
n
u
ntil
fa
ult
is
c
le
a
re
d.
C
h
e
c
k
for
:
-
S
tuck
ope
n
or
le
ak
y
g
a
s
val
v
e.
2
3
PRESSURE
S
W
IT
CH
DI
D
N
O
T
O
P
EN
–
Check
fo
r:
-
O
bst
ruct
e
d
p
re
ss
ur
e
tu
b
e.
-
P
re
ss
ure
s
w
itc
h
s
tu
ck
close
d
.
2
4
SECO
NDAR
Y
VO
L
T
AG
E
F
USE
IS
O
P
E
N
Check
fo
r:
-
S
hort
ci
rc
uit
in
s
e
c
on
da
ry
v
o
lta
g
e
(2
4
V
)
w
iring
incl
udi
n
g
the
rm
osta
t
le
a
ds
.
Discon
n
ec
t
th
e
rm
o
s
tat
lea
ds
to
is
ol
at
e
shor
t
c
ir
cuit.
32
LO
W
P
RE
S
S
URE
S
W
IT
C
H
D
ID
N
O
T
CLOSE
O
R
R
EOPENED
–
If
op
en
s
d
u
rin
g
b
low
er
o
n
-d
e
lay
pe
ri
o
d
,
b
lo
w
e
r
w
ill
c
o
m
e
on
fo
r
the
sel
e
ct
ed
blo
w
er
off
-del
a
y
.
If
ope
n
s
w
it
hi
n
5
m
in
u
tes
a
ft
er
igni
ti
on
th
e
ne
x
t
he
atin
g
c
y
c
le
w
ill
be
re
stric
ted
to
ma
x
imu
m-h
e
a
t.
C
h
e
c
k
fo
r:
-
P
rop
e
r
v
en
t
s
iz
in
g.
-
A
ir
leak
b
e
tw
e
e
n
v
esti
bul
e
a
n
d
b
lo
w
e
r
com
p
a
rtm
ent
.
-
L
o
w
in
le
tg
a
s
p
re
s
s
u
re
(i
fL
G
P
S
u
s
e
d
).
-R
e
s
tr
ic
te
d
v
e
n
t.
-
D
iscon
n
ec
ted
o
r
o
bstr
uct
e
d
p
re
ssu
re
tubi
ng.
-
D
efec
ti
ve
or
m
is
w
ir
e
d
p
ress
u
re
s
w
it
ch
e
s
-
E
x
c
essi
v
e
w
in
d
.
If
p
ro
blem
p
e
rsi
s
ts
tu
rn
setu
p
s
w
it
c
h
S
W
1
-3
ON
to
bo
ost
in
duc
er
sp
eed
-
P
lu
gg
ed
c
o
n
d
e
n
sa
te
drai
n.
-
W
ater
in
ven
t
pi
pin
g
,
p
ossi
ble
s
ag
gi
n
g
pipe
.
33
L
IM
IT
C
IRCU
IT
F
A
ULT
–
In
dica
tes
th
e
lim
it
o
r
a
flam
e
roll
o
ut
s
w
it
c
h
is
op
en
or
the
fu
rn
a
c
e
is
o
p
e
ra
ti
n
g
in
max
imu
m-h
ea
t
o
n
ly
m
o
de
due
to
2
s
u
cc
essiv
e
lim
it
tri
ps
wh
ile
o
p
er
a
ti
n
g
a
t
a
ny
ra
te
<
71%
o
f
m
a
x
im
u
m
ra
te
.
B
lo
wer
w
ill
run
for
4
m
in
.
o
r
u
n
til
o
p
en
sw
it
c
h
re
ma
ke
s
w
h
ic
h
e
v
er
is
lo
nge
r.
If
op
e
n
lo
ng
er
th
an
3
m
in
.,
co
de
c
h
a
nge
s
to
lo
ck
ou
t
#
13.
If
o
p
e
n
less
th
a
n
3
m
in.
statu
s
co
de
#3
3
c
onti
nu
es
to
fl
ash
u
ntil
b
low
er
sh
u
ts
o
ff
.
F
la
me
ro
ll
o
u
t
s
w
it
c
h
re
qu
ir
e
s
ma
nu
a
l
re
s
e
t.
C
h
e
c
k
fo
r:
-
L
oo
se
blo
w
er
whe
e
l.
-
D
efec
tive
s
w
itch
o
r
co
nn
ectio
n
s.
-
Im
p
ro
per
m
inim
um
-
o
r
m
a
x
im
um
-h
e
a
t
gas
inp
ut
a
d
jus
tm
e
nt
.
-
Im
p
ro
pe
r
lim
it
s
w
itc
h
o
r
n
o
lim
it
g
a
sk
et.
-
D
irt
y
filt
er
or
re
stri
c
te
d
d
u
ct
s
y
stem
.
34
IGN
IT
ION
P
R
OV
IN
G
F
A
IL
URE
–
If
fla
m
e
is
not
s
en
sed
d
urin
g
the
trial
fo
r
ig
nitio
n
p
e
ri
o
d
,
the
co
n
tr
o
l
w
ill
rep
ea
t
th
e
ig
n
it
ion
seq
u
en
ce
3
m
or
e
tim
es
be
fo
re
lo
ck
out
#
14
occu
rs.
If
fl
a
m
e
si
gnal
is
los
t
d
u
ri
ng
th
e
b
low
er
o
n
-d
e
lay
pe
ri
o
d
,
b
lo
w
e
r
w
ill
c
o
m
e
o
n
for
the
sel
e
cte
d
blo
w
er
off-
del
a
y
.
Ch
ec
k
the
follo
w
ing
item
s
fi
rst
bef
o
re
p
roc
ee
di
ng
to
th
e
n
e
x
t
s
te
p.
-
G
as
v
a
lve
tu
rn
e
d
o
ff.
-
M
an
ual
s
h
u
t-
off
v
alve
.
-
G
REEN/
Y
EL
L
O
W
w
ir
e
M
UST
b
e
con
n
ect
e
d
to
fur
nac
e
s
h
e
e
t
m
et
al
.
-
F
la
me
s
e
ns
o
r
mu
s
t
n
o
t
b
e
g
ro
un
de
d
.
T
o
d
e
te
rm
in
e
w
he
th
e
r
th
e
p
ro
b
le
m
is
in
th
e
gas
v
alve
,
ig
n
ite
r,
o
r
fl
a
m
e
s
e
ns
or
th
e
s
y
s
te
m
c
a
nb
eo
p
e
ra
te
d
inc
o
m
p
o
n
e
n
t
te
s
t
mo
d
e
.
T
o
c
he
c
k
th
e
ign
it
er
re
mo
v
e
th
e
R
the
rm
o
sta
t
co
nn
ecti
on
fr
om
th
e
c
on
tr
ol,
re
s
e
t
p
ow
er
,
a
nd
pu
t
s
e
tup
sw
it
c
h
S
W
1
-6
in
the
O
N
p
ositi
o
n
to
s
tar
t
th
e
c
om
po
ne
nt
test.
D
o
e
s
th
e
ign
it
er
g
low
or
an
ge
/w
h
it
e
by
th
e
e
n
d
o
f
the
15
s
e
c
o
nd
w
a
rm-u
p
p
er
io
d?
U
n
pl
u
g
ig
ni
te
r
h
ar
ne
ss
fr
om
co
nt
rol
a
nd
re
pe
a
t
c
o
mpo
n
e
n
t
te
s
t
b
y
tur
n
ing
se
tu
p
sw
it
ch
S
W
1-6
O
F
F
a
n
d
the
n
b
ack
O
N.
C
h
eck
fo
r
1
1
5V
bet
w
ee
n
p
in
3
a
nd
NEUT
RAL-
L
2
o
n
th
e
c
ont
rol
.
W
a
s
11
5
V
pres
en
t
fo
r
th
e
1
5
s
ec
on
d
p
eri
o
d?
C
heck
c
o
n
n
e
cti
o
ns
and
re
tr
y
.
If
cu
rr
ent
is
n
ear
ty
pi
cal
v
al
u
e
(4.
0
-6
.0
nom
in
a
l)
an
d
b
urn
e
rs
w
ill
not
sta
y
o
n
,
rep
eat
ch
eck
in
m
a
x
-he
at.
If
b
ur
ne
rs
w
ill
still
n
o
t
st
a
y
o
n
re
pl
ace
cont
rol.
If
bu
rn
ers
o
p
e
ra
te
in
m
a
x-
h
eat
the
n
s
w
it
ch
to
interm
edia
te-
h
e
a
t,
che
c
k
m
a
nifol
d
p
ress
u
re
.
If
O
K
,
c
h
e
c
k
b
ur
ne
r
c
a
rry
ov
er
an
d
flam
e
s
e
n
s
o
r
locati
o
n.
C
lean
fl
a
m
e
se
nso
r
w
it
h
fin
e
st
eel
w
ool
and
re
c
he
ck
curr
en
t.
N
o
m
inal
c
ur
re
nt
is
4
.0
to
6
.0
mi
c
roa
mp
s
.
Is
cu
rre
nt
ne
ar
ty
pi
c
a
l
v
alue
?
R
epl
a
c
e
e
le
ct
ro
de.
W
ill
ma
in
b
u
rn
e
rs
ign
it
e
a
nd
s
tay
o
n
?
R
epl
a
c
e
fur
nac
e
c
ont
rol
.
Fi
x
e
d.
NO
YE
S
YE
S
YE
S
NO
NO
1
5
BL
O
W
ER
M
O
TO
R
L
O
C
K
O
UT
–
In
d
ic
a
te
s
the
b
lo
wer
faile
d
to
reac
h
2
5
0
R
P
M
or
th
e
b
low
er
fa
ile
d
to
c
o
mmu
n
ica
te
w
it
h
in
3
0
seco
nds
a
ft
er
bei
n
g
tur
ne
d
O
N
in
tw
o
succe
ssive
he
atin
g
c
y
c
les.
Co
ntr
o
l
w
ill
aut
o
-r
ese
t
a
fte
r
3
ho
urs
.
S
e
e
c
od
e
4
1.
45
CONT
ROL
C
IRCU
IT
R
Y
LOC
K
OU
T
A
uto
-r
e
set
afte
r
1
ho
ur
lock
out
d
u
e
to:
-
F
la
m
e
ci
rcui
t
fail
u
re
.
-
G
a
s
va
lv
e
re
lay
st
u
c
k
ope
n.
-
S
oft
w
a
re
c
he
ck
err
o
r.
R
e
s
e
t
p
ow
e
r
to
c
lea
r
lock
out.
R
epl
a
c
e
co
ntr
o
l
if
c
o
de
re
pe
at
s
.
R
epl
a
c
e
fur
nac
e
c
ont
rol
.
C
heck
fo
r
co
nti
n
uit
y
in
th
e
har
nes
s
a
n
d
ignit
er.
R
e
p
lac
e
def
ecti
ve
com
p
on
ent
.
Reco
nn
ect
the
R
th
e
rm
os
tat
lea
d
a
nd
s
e
t
th
er
mo
s
tat
to
c
a
ll
fo
r
h
e
a
t.
C
o
n
n
e
c
t
voltm
e
te
r
a
cr
oss
g
as
valv
e
B
LUE
a
n
d
GRE
E
N/
Y
E
LL
O
W
w
ires.
D
o
es
gas
v
al
ve
recei
v
e
2
4V
?
D
o
e
s
g
a
s
v
a
lve
o
p
en
an
d
a
llow
ga
s
to
flo
w
?
Do
th
e
m
ai
n
b
ur
ner
s
ig
nite
?
Do
th
e
m
ai
n
b
ur
ner
s
st
a
y
o
n
?
Allow
u
nit
to
d
ro
p
to
m
in-
h
ea
t,
and
ch
eck
m
anifol
d
p
res
s
ur
e.
R
epe
at
test
to
che
c
k
for
in
te
rm
it
te
nt
op
er
a
ti
o
n
.
C
heck
th
a
t
a
ll
g
a
s
v
al
ves
a
re
tur
ned
o
n
.
R
epl
a
ce
val
v
e.
C
heck
c
o
n
n
e
cti
o
ns.
If
O
K
,
repl
ace
c
o
n
tr
ol.
C
heck
fo
r:
-
Ina
deq
ua
te
fl
am
e
c
ar
ry
ov
er
or
rou
g
h
igni
tion
.
-
L
ow
in
le
t
g
as
pr
e
s
su
re
.
-
P
ro
pe
r
fi
ri
n
g
ra
te.
Repe
at
c
a
ll
fo
r
h
e
a
t
a
nd
ch
eck
fl
a
m
e
sens
or
c
u
rr
e
n
t
d
uri
n
g
trial
fo
r
ig
n
iti
o
n
peri
od.
Is
the
D
C
m
icr
oam
p
s
b
el
o
w
0.5
?
YE
S
YE
S
YE
S
YE
S
YE
S
NO
NO
NO
NO
NO
NO
4
3
LO
W
O
R
M
ED
IU
M
P
RESSURE
S
W
IT
CH
O
P
E
N
W
H
IL
E
M
E
D
IU
M
O
R
H
IG
H
P
R
E
S
S
U
R
E
S
W
IT
C
H
IS
C
L
O
S
E
D
-
Check
fo
r:
-
L
o
w
or
Me
d
p
res
s
.
s
w
itc
h
s
tuck
o
p
e
n
.
-
Discon
n
ec
ted
o
r
o
bstr
uct
e
d
p
re
ssu
re
tubi
ng.
-
Im
p
ro
per
p
ress
ur
e
s
w
itc
h
w
ir
in
g
.
-
L
ow
in
le
t
g
as
pr
e
s
su
re
(i
f
L
G
P
S
u
se
d
).
-
P
lugg
ed
c
o
n
d
e
n
sa
te
drai
n.
-
W
ater
in
ven
t
pi
pin
g
,
p
ossi
bl
e
s
ag
gin
g
pi
pe
.
A11290B
