83
11
NO
PRE
V
IO
US
CODE
–
Sto
re
d
c
o
d
e
s
a
re
eras
ed
aft
e
r 72
h
o
ur
s.
Run
s
y
st
em
thr
o
ug
h a
h
e
ati
n
g or cooli
n
g c
y
cle
to
check
s
y
st
em
.
1
2
BL
O
W
ER ON AF
TER PO
W
E
R UP
–
(11
5
V
OR
24V
)
–
No
rm
al o
p
e
rati
o
n.
Blower
r
u
ns f
o
r 9
0
se
c
o
n
d
s, if
u
n
it is
po
w
e
re
d u
p
duri
ng
a c
a
ll f
o
r
hea
t (R
-W
c
lo
s
ed
)
o
r
w
h
en
(R-
W
o
p
e
n
s
) du
ri
n
g
the
blo
w
e
r on-
d
el
a
y
p
e
ri
od.
1
3
LI
M
IT
C
IR
C
U
IT
L
O
C
K
O
U
T
–
Lo
c
k
o
u
t
occu
rs
if
th
e lim
it o
r flam
e
r
o
ll
out
is o
p
e
n
lo
n
g
e
r t
h
an
3
m
in
u
te
s
.
C
o
n
tr
o
l w
ill
a
u
to-
rese
t a
fte
r 3
ho
urs
. S
e
e c
o
d
e
3
3
.
14
IGN
IT
ION
LOCK
OUT
–
S
y
st
e
m
fa
iled
to
ignite
g
a
s a
n
d
pr
ove
flam
e i
n
4 at
tem
p
ts
.
Cont
rol w
ill
au
to-
res
et aft
e
r 3
h
o
u
rs.
S
e
e
s
tat
u
s
c
o
de
34
.
2
1
GAS
HEATI
N
G
L
O
CKOUT
–
Tu
rn
of
f
po
w
e
r
and
w
a
it
5
m
in
u
te
s to
r
e
tr
y
. Ch
e
c
k
fo
r:
-
Stu
c
k
close
d
g
a
s v
a
lve
r
e
la
y
on
con
tr
o
l.
-
Mis
w
ir
e o
r s
h
or
t t
o
g
a
s v
a
lve
w
ire
.
2
2
ABNOR
M
A
L
FL
A
M
E
-PROV
IN
G
S
IGN
AL
F
lam
e is
p
rov
ed
while
gas
va
lv
e is
de
-
ene
rgi
zed.
Indu
cer
w
ill
r
u
n
until
fa
ult is
clea
re
d
. C
h
eck
fo
r:
-
S
tuck
ope
n
or l
e
ak
y
ga
s val
v
e.
23
PRE
S
SURE S
W
IT
CH DI
D N
O
T
OPEN
–
Che
c
k
fo
r:
-
Obst
ruct
ed
pr
ess
u
re
tu
be.
-
P
ress
u
re
s
w
itc
h
st
uck
close
d
.
2
4
SECONDAR
Y
VOL
T
AGE
F
U
S
E
I
S
O
P
EN
Che
c
k
fo
r:
-
Short
circ
uit i
n
se
con
d
a
ry
v
o
lta
g
e
(2
4V)
w
iring
incl
udin
g t
h
e
rm
o
sta
t le
ads
.
Discon
n
ec
t th
erm
o
sta
t lea
d
s t
o
is
olat
e
shor
t cir
c
uit.
31
LP
S
or
HP
S
P
R
E
S
S
U
R
E
S
W
IT
CH
DID
NOT
CLOSE
OR REOPENE
D
–
If
o
p
e
n
s
duri
ng blo
w
er on
-d
ela
y
pe
rio
d
,
bl
o
w
e
r w
ill
com
e
o
n
f
o
r t
h
e
se
le
cte
d
b
lo
w
e
r
off-
del
a
y
.
Che
c
k
fo
r:
- P
rop
er
v
e
n
t
s
iz
in
g
.
-
A
ir leak
b
e
tw
e
e
n
vesti
b
ul
e a
n
d
blo
w
er
com
p
a
rtm
ent
.
-
Lo
w
i
n
let
ga
s p
ress
u
re
(if
L
G
P
S
us
ed)
.
- Discon
n
ec
te
d
o
r
o
b
str
u
ct
ed
pr
essu
re
tubi
ng.
-
D
e
fe
ct
iv
e
o
r mi
s
w
ir
ed
pr
e
s
su
re
sw
it
c
hes
- Ex
c
e
ssiv
e
w
in
d
.
-
P
lug
ge
d
c
o
nd
en
s
a
te
d
ra
in
-
W
a
te
r in
ve
nt pi
pin
g
, p
o
ssi
ble s
a
g
g
in
g
pi
pe
- Restri
cte
d
ve
nt.
- Defec
tive
In
d
u
c
e
r
m
o
to
r.
-
Lo
w
i
n
d
u
ce
r vo
lt
a
g
e
(11
5
VAC)
3
3
LI
M
IT
C
IR
C
U
IT
F
A
U
L
T
–
I
n
dica
te
s th
e
lim
it, flam
e r
o
llo
u
t is
op
en.
B
lo
w
er
w
ill
r
u
n
for 4
m
in. or un
til
o
p
en
s
w
itc
h
r
e
m
a
k
e
s
which
e
ve
r is l
o
ng
er
.
If
o
p
en
lon
g
e
r t
h
a
n
3
mi
n
, c
o
de
ch
an
ge
s
to
l
o
c
k
o
u
t #7
.
If
ope
n
less t
h
an
3
m
in
. st
atu
s
co
de
#4
con
tin
u
e
s
to
fla
s
h
until
b
lo
w
er
sh
uts
off.
F
lam
e
roll
o
u
t s
w
it
ch
re
qui
res m
a
nu
al r
e
se
t.
Che
c
k
fo
r:
-
Loo
s
e blo
w
er
whe
e
l.
-
Defec
tive s
w
itch
o
r
co
nn
ectio
n
s.
-
Dirt
y
filt
er
o
r r
e
str
ic
te
d
d
u
ct s
y
ste
m
.
-
Im
p
ro
p
er
g
a
s in
put
a
d
justm
e
nt.
-
Im
p
ro
p
er
lim
it s
w
itc
h
o
r n
o
g
a
sk
et unless
noted on switch.
34
IGN
IT
ION
P
R
OV
IN
G
F
A
IL
URE
–
If
f
la
m
e
is not
se
nse
d
d
u
ri
ng
the
tri
a
l f
o
r i
g
niti
on
peri
od,
th
e
c
o
nt
rol w
ill
re
pe
at
th
e
ig
niti
o
n
seq
u
en
c
e
3 m
o
re
tim
e
s
be
fo
re l
o
ck
out
#14
occu
rs.
If fl
am
e si
gnal
is los
t d
u
ri
ng t
h
e
blo
w
e
r
on-
d
el
a
y
p
e
ri
od,
blo
w
er
w
ill
c
o
m
e
on f
o
r
the
sel
e
ct
ed
blo
w
er
off
-del
a
y
.
Check
th
e f
o
llo
w
in
g it
em
s firs
t b
e
fo
re
proc
ee
din
g
t
o
th
e n
e
x
t ste
p
.
-
Ga
s v
a
lve
tu
rn
ed
off.
- Man
u
al
sh
ut-
o
ff
v
a
lve
.
-
G
ree
n
/Y
e
llow
w
ir
e
M
U
ST b
e
co
nn
e
c
te
d
to
f
u
rn
ace
sh
eet
m
e
ta
l.
-
Flam
e s
e
n
s
or
m
u
st
not
be
gr
ou
nd
ed.
T
o
det
e
rm
in
e
w
h
et
her
th
e p
ro
b
lem
is i
n
the gas
valv
e,
ig
nit
e
r, or
flam
e sen
s
o
r
th
e
s
y
stem
c
a
n
be
op
er
ate
d
in
th
e com
p
on
ent
test m
o
de
to c
h
eck
th
e i
g
nit
e
r.
F
irst
rem
o
v
e
th
e R
the
rm
o
st
at c
o
n
n
ec
tion
fr
om
th
e
co
nt
ro
l an
d
in
it
ia
te
th
e
co
mp
on
en
t te
s
t
seq
u
en
ce.
Do
es t
h
e i
g
nit
e
r
glo
w
ora
n
g
e
/w
hi
te b
y
t
h
e en
d
o
f
th
e 15
s
e
co
nd
warm
-u
p peri
od
?
Che
ck
co
nn
ectio
n
s
and
r
e
tr
y
.
If
cu
rr
ent i
s
n
ear
t
y
pi
cal v
a
lu
e
(4.
0
-6
.0 nom
in
al) an
d
b
u
rn
er
s
w
ill
not
sta
y
o
n
, r
epl
ace
cont
rol.
Cl
ean
flam
e se
nso
r w
it
h
fin
e
st
eel wool
and
r
e
che
c
k
cu
rr
en
t. N
o
m
ina
l
cur
re
n
t i
s
4.
0 t
o
6.
0
m
ic
ro
a
m
p
s
.
Is
cu
rre
n
t
ne
ar
ty
pic
a
l v
a
lue
?
Rep
la
ce elect
ro
de.
W
ill m
a
in bur
n
er
s ig
nite
an
d st
a
y
on
?
Repla
ce f
u
rnac
e c
ont
rol.
Fi
x
e
d.
NO
YE
S
YE
S
YE
S
YE
S
NO
NO
45
CONT
ROL
C
IRCU
IT
R
Y
LOCK
OUT
A
u
to
-r
eset
afte
r 1
ho
ur
lock
out
d
ue
to
:
- Flam
e
ci
rcui
t
fail
ur
e.
-
Ga
s v
a
lve
r
e
la
y
s
tu
c
k
ope
n.
- Soft
w
a
re
che
c
k
e
rr
o
r.
Rese
t p
o
wer
to
cle
ar
lock
ou
t. R
epl
ace
co
nt
ro
l if
co
de
re
pea
ts.
Unp
lu
g
ig
nit
e
r
har
n
e
s
s f
rom
co
nt
ro
l
and
initiat
e
a
n
ot
he
r c
o
m
p
on
en
t te
st
seq
u
en
ce.
Ch
eck
for
11
5V
b
e
tw
een
pi
n
1 a
n
d NEUT
RA
L
-L
2
o
n
t
h
e
con
tr
o
l.
W
a
s
115V
pr
ese
n
t f
o
r th
e 1
5
s
e
co
nd
pe
riod
?
Repla
ce f
u
rnac
e c
ont
rol.
Check
fo
r co
nti
n
uit
y
i
n
t
h
e
har
nes
s a
nd i
g
nit
e
r.
Re
plac
e
def
e
ctive
com
p
on
ent
.
R
e
c
on
ne
c
t th
e
R
t
h
e
rmo
st
a
t l
e
ad
a
n
d se
t
th
e
rm
o
sta
t to
ca
ll
fo
r h
e
at.
Co
nn
ect
voltm
e
te
r acr
o
ss gas valv
e
co
nn
ecti
ons
.
Doe
s
gas
va
lv
e
re
c
e
ive 24V
?
D
o
e
s
g
a
s v
a
lv
e
o
p
en
an
d a
llo
w
ga
s
to
flo
w
?
Do th
e m
a
in
b
u
rn
er
s ig
nite
?
Do th
e m
a
in
b
u
rn
er
s st
a
y
o
n
?
A
llo
w blo
wer
to
com
e
on
an
d
rep
eat
tes
t t
o
ch
eck
for
in
te
rm
it
te
nt
op
er
a
tio
n
.
Check
th
at
all
g
a
s v
a
lves
ar
e
tur
ned
o
n
. R
e
pl
ace
valv
e.
Che
ck
co
nn
ectio
n
s.
I
f
OK,
repl
ace
co
ntr
o
l.
Repe
at c
a
ll f
o
r
he
at
and
ch
eck
flam
e
sens
or c
u
rr
e
n
t
duri
ng
trial
fo
r ig
nitio
n
peri
od.
Is
the
DC m
icr
oam
p
s
bel
o
w
0.5
?
YE
S
YE
S
YE
S
YE
S
YE
S
NO
NO
NO
NO
NO
NO
Che
ck
fo
r:
-
In
a
d
eq
ua
te
fl
am
e c
a
rr
y
o
v
e
r
or rou
gh
igni
tion
.
-
Lo
w
i
n
let
ga
s p
ress
u
re
.
- Prop
er
firin
g
r
a
te
.
If LPS opens longer than 5 minutes,
inducer shuts of
f for 15 minutes before
retry
. If HPS remains open for one minute
after gas valve closes the furnace will shut
down and retry
. If HPS fails to close on
three successive cycles the furnace will
lockout for 3 hrs before retry
.
A12421
Troubleshooting Guide (Cont)
912S
