SERVICE AND TECHNICAL SUPPORT MANUAL
Gas Furnace: (F/G)9MVE
Specifications subject to change without notice.
440 04 4801 04
28
Figure 17
Troubleshooting Guide
−
Flow Chart
Is
A
M
BER
LE
D st
at
u
s lig
ht
O
N
so
lid
,
al
ter
na
tel
y fl
as
hi
ng
b
rig
h
t-di
m
-b
ri
ght
-di
m
lik
e a he
art
be
at,
or
flas
hi
ng
ON
an
d
OF
F
?
Is
th
er
e 2
4V
at
S
E
C
-1
a
nd S
E
C
-2?
Is
th
er
e
1
15V
at L1 an
d
L
2?
Is
th
e 2
4V
f
use
op
en
?
Is
do
or
s
w
itc
h cl
o
sed
?
R
epl
a
ce t
ra
nsf
orm
er
.
R
epl
a
ce do
or
sw
itch
.
Is
th
er
e 1
15V
goi
ng t
o s
w
itch
?
C
lose
the
d
oor
s
w
itc
h.
Is
ci
rc
ui
t
bre
ak
er cl
ose
d?
C
heck
fo
r co
nti
nui
ty
in
w
ire
from
ci
rcui
t
br
ea
ke
r to
fu
rn
ac
e.
C
lose
ci
rc
ui
t b
re
ak
er a
nd
go
ba
ck
to
START.
Is
A
M
BER
LE
D st
at
u
s lig
ht
a
lte
rn
a
te
ly
flashi
ng
bri
ght
-di
m
-b
rig
ht-
di
m
li
ke
a
hea
rtb
ea
t?
D
ete
rm
ine s
tat
us c
od
e. T
h
e st
atu
s co
d
e
is
a si
ngl
e
or
t
w
o
di
gi
tn
um
be
r
w
ith
t
he
first num
b
er det
erm
in
ed b
y
the num
b
er of
shor
t fl
ash
es a
nd
th
e se
con
d
num
be
r
afte
r t
he
pl
us
(+
) si
g
n i
s t
he
num
b
er
of
long
fl
as
hes
?
T
he
las
ts
ta
tus
co
de
has
cl
e
are
d.
T
o
re
call
a
pr
evio
us st
atu
s co
de
disc
on
nec
t
the R
th
erm
os
tat
co
nne
cti
o
n, r
es
et
po
w
e
r,
an
d p
ut s
etu
p s
w
itch S
W
1-1 i
n
the
ON
p
osi
tion.
T
he A
M
B
E
R
LE
D
w
ill
flash
th
e st
atus
co
des i
n t
he
or
de
r of
occu
rr
enc
e. R
eco
rd
sta
tus c
od
es
unti
l
hea
rtb
ea
t fla
she
s. A
fter
he
ar
tbe
at
flash
es
seve
ral
ti
m
es
the s
tat
us c
od
es
w
ill
re
pea
t. S
tatu
s co
de
s a
re
er
ase
d
afte
r 7
2 h
ou
rs
or c
an
be
m
an
ual
ly
er
as
ed
b
y p
utti
ng s
etu
p s
w
itch S
W
1-1 i
n
th
e O
N
posi
tio
n
an
d j
um
p
eri
ng R
, W
/W
1, and
Y
/Y
2
si
m
ul
ta
ne
ousl
y u
nti
l t
he
he
art
be
at
flash
es. W
hen don
e
put
set
up s
w
itch
S
W
1-1 i
n t
he
OF
F
posi
tio
n
.
W
as there
a p
revi
ous
stat
us c
od
e o
th
er
tha
n th
e
hea
rtb
ea
t?
Go t
o s
ecti
o
n b
el
o
w
fo
r t
he s
tat
us c
od
e
that
w
as fl
as
he
d.
D
oes
the
co
ntr
ol
r
esp
on
d t
o
W
/W
1,
W
2,
Y
1
,
Y
/Y
2,
a
nd
G (
24V
) t
herm
o
stat
si
gnal
s?
R
un s
ystem
t
hr
ou
gh
a l
o
w-h
eat
, hi
gh
-
hea
t, o
r c
ool
in
g c
yc
le t
o c
heck
o
per
ati
o
n.
S
tatus
co
des
ar
e e
ras
ed
aft
er
72
h
our
s
or c
an
be m
a
nu
al
ly
era
sed
b
y
pu
tti
n
g
setu
p s
w
itch S
W
1-1 i
n
the
ON
posi
tio
n
and
ju
m
pe
rin
g R
, W
/W
1, and
Y
/Y
2
si
m
ul
tan
eo
usl
y unti
l the
he
ar
tbe
at
flash
es.
Is
24V
pr
es
ent
at
W
/W
1,
W
2, Y
1,
Y
/Y
2
or
G
th
erm
os
tat term
in
al
s on the
fu
rn
ace
cont
rol
?
C
heck
ro
om
th
erm
os
tat
or
in
ter
co
nne
cti
n
g ca
bl
e
.
D
iscon
nec
t al
l the
th
erm
os
tat
w
ire
s fr
o
m
the fur
nac
e
cont
rol
.
D
oes
the
p
robl
em
r
epe
at
w
he
n u
si
ng
a
ju
m
per
w
ire
?
R
epl
a
ce f
ur
nac
e c
ont
rol
.
T
he th
erm
os
tat
is
n
ot c
om
pati
bl
e
w
ith
the
fur
nac
e co
ntr
ol
.
E
ithe
r i
nstal
l a
bal
la
st
resi
st
or,
co
nn
ect t
he
C
om
2
4V
th
erm
os
tat
term
in
al
to
th
e t
herm
o
stat
, o
r r
epl
ace
th
e
th
er
mo
st
at
.
YE
S
NO
YE
S
YE
S
YE
S
YE
S
Y
E
S
YE
S
YE
S
STAR
T
YE
S
YE
S
NO
NO
NO
NO
NO
NO
NO
NO
YE
S
NO
NO
Trou
bles
hoo
tin
g
Gu
id
e
R
epl
a
ce f
ur
nac
e c
ont
rol
.
YE
S
R
epl
a
ce f
us
e th
en
di
sc
on
nect
th
erm
os
ta
t
leads
to
is
ol
ate
sho
rt ci
rcui
t.
NO
Is
A
M
BER
LE
D st
at
u
s lig
ht
O
N
so
lid
?
NO
YE
S
C
heck
to m
ak
e s
ur
e t
hat
th
e co
rr
ect
m
odel
pl
ug
P
L4
is
in
stal
led.
T
he
w
iri
n
g
schem
ati
c sh
o
w
s
all v
alid m
o
del
plu
gs.
Is
th
e c
orr
ect m
o
del
pl
u
g i
n
stal
led?
T
he co
ntr
ol
is
lo
ck
ed
out
an
d
w
ill
aut
o-
rese
t a
fte
r 1
ho
ur.
L
ock
out
coul
d
be
du
e
to
a
n
y of
the fol
lo
w
in
g
:
-
F
la
m
e s
en
se ci
rcui
t fai
lur
e.
-
G
as v
al
ve
rel
a
y s
tuck
o
pen
.
-
S
oft
w
a
re che
ck
err
or.
R
eset
po
w
er
to
cl
e
ar l
ock
out.
R
e
pl
ac
e
cont
rol
if
co
de
re
pe
ats.
YE
S
R
epl
a
ce m
o
del
pl
u
g P
L
4.
NO
