SERVICE AND TECHNICAL SUPPORT MANUAL
Gas Furnace: (F/G)9MVE
Specifications subject to change without notice.
440 04 4801 03
28
Figure 17
Troubleshooting Guide
−
Flow Chart
Is
A
M
BER
L
E
D st
a
tu
s
lig
h
t O
N
so
li
d
,
al
ter
n
a
tel
y
fl
as
hi
ng
b
ri
g
h
t-di
m
-b
ri
ght
-di
m
lik
e
a he
art
b
e
a
t,
or
fl
as
hi
ng
ON
an
d
OF
F
?
Is
th
er
e 2
4
V
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
4
V
f
u
se
op
en
?
Is
do
or
s
w
it
c
h
cl
o
s
ed
?
R
epl
a
c
e t
ra
n
sf
orm
e
r.
R
epl
a
c
e do
or
s
w
it
ch
.
Is
th
er
e 1
15V
goi
ng t
o
s
w
it
ch
?
C
lose
the
d
oor
s
w
it
c
h
.
Is
ci
rc
ui
t
bre
a
k
e
r cl
ose
d?
C
heck
fo
r co
nti
nui
ty
i
n
w
ire
from
ci
rcui
t
b
rea
ke
r to
fu
rn
a
c
e.
C
lose
ci
rc
ui
t b
re
a
k
e
r a
nd
go
ba
ck
to
START.
Is
A
M
BER
L
E
D st
a
tu
s
lig
h
t a
lte
rn
a
te
ly
fl
ashi
ng
bri
g
ht
-di
m
-b
ri
g
h
t-
di
m
l
ik
e
a
hea
rtb
ea
t?
D
e
te
rm
ine s
tat
us c
o
d
e
. T
h
e st
atu
s
co
d
e
is
a si
ngl
e
or
t
w
o
di
gi
t
n
um
be
r
w
it
h
t
he
fi
rst num
b
e
r det
erm
in
ed b
y
t
he num
b
e
r of
shor
t fl
ash
e
s a
nd
th
e se
con
d
num
be
r
afte
r t
h
e
pl
us
(+
) si
g
n
i
s
t
he
num
b
er
of
long
fl
as
hes
?
T
h
e
las
t
s
ta
tus
co
de
has
cl
e
a
re
d.
T
o
re
call
a
p
re
vio
u
s st
atu
s
co
de
disc
on
nec
t
the R
th
erm
o
s
tat
co
nne
cti
o
n, r
e
s
e
t
po
w
e
r,
an
d p
u
t s
e
tu
p s
w
it
ch S
W
1-1 i
n
the
ON
p
o
si
ti
on.
T
he A
M
B
E
R
LE
D
w
ill
fl
ash
th
e st
atus
co
des i
n
t
he
or
de
r of
occu
rr
enc
e. R
e
co
rd
sta
tus c
o
d
e
s
unti
l
hea
rtb
ea
t fla
s
he
s. A
fter
he
ar
tbe
a
t
fl
ash
e
s
s
eve
ral
ti
m
e
s
the s
tat
us c
o
d
e
s
w
ill
re
pea
t. S
tatu
s
co
de
s a
re
er
ase
d
afte
r 7
2
h
o
u
rs
or c
a
n
be
m
a
n
ual
ly
er
as
ed
b
y
p
u
tti
n
g s
e
tu
p s
w
it
ch S
W
1-1 i
n
th
e O
N
posi
ti
on
an
d j
u
m
p
eri
ng R
,
W
/W
1
, and
Y
/Y
2
si
m
u
lt
a
n
e
ousl
y
u
n
ti
l t
he
he
art
b
e
a
t
fl
ash
e
s. W
hen don
e
put
set
up s
w
it
ch
S
W
1-1 i
n
t
he
OF
F
posi
ti
o
n
.
W
a
s there
a p
revi
ous
stat
us c
o
d
e
o
th
e
r
tha
n
th
e
hea
rtb
ea
t?
Go t
o
s
e
cti
o
n b
e
lo
w
fo
r t
he s
tat
us c
o
d
e
that
w
a
s fl
as
he
d.
D
oes
the
co
ntr
o
l r
e
sp
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
y
stem
t
h
ro
u
gh
a l
o
w-h
eat
, hi
gh
-
hea
t, o
r c
ool
in
g c
y
c
le t
o
c
heck
o
per
ati
o
n.
S
tatus
co
des
ar
e e
ras
ed
aft
e
r 72
h
our
s
or c
a
n
be m
a
nu
al
ly
era
s
ed
b
y
pu
tti
n
g
setu
p s
w
it
ch S
W
1-1 i
n
the
ON
posi
ti
o
n
and
j
u
m
p
e
ri
n
g R
, W
/W
1
, and
Y
/Y
2
si
m
u
lt
an
eo
usl
y
unti
l the
he
ar
tbe
a
t
flash
e
s.
Is
24V
pr
es
ent
at
W
/W
1
,
W
2
, Y
1
,
Y
/Y
2
or
G
th
erm
o
s
tat term
in
al
s on the
fu
rn
ace
cont
rol
?
C
heck
ro
om
th
erm
o
s
tat
or
in
ter
c
o
nne
cti
n
g ca
bl
e
.
D
iscon
nec
t al
l
the
th
erm
o
s
tat
w
ire
s fr
o
m
the fur
n
ac
e
c
ont
rol
.
D
oes
the
p
robl
em
r
epe
at
w
h
e
n
u
s
in
g
a
ju
m
per
w
ire
?
R
epl
a
c
e f
u
rnac
e c
ont
rol
.
T
he th
erm
o
s
tat
i
s
n
o
t c
o
m
p
ati
b
le
w
ith
the
fur
nac
e co
ntr
o
l.
E
ithe
r i
n
stal
l
a
bal
la
st
resi
st
or,
co
nn
ect t
h
e
C
o
m
2
4V
th
erm
o
s
tat
term
in
al
to
th
e t
herm
o
stat
, o
r r
e
pl
ace
th
e
th
er
mo
s
tat
.
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
c
e f
u
rnac
e c
ont
rol
.
YE
S
R
epl
a
c
e f
u
s
e
th
en
di
sc
on
nect
th
e
rm
os
ta
t
leads
to
i
s
ol
ate
sho
rt ci
rcui
t.
NO
Is
A
M
BER
L
E
D st
a
tu
s
lig
h
t O
N
so
li
d
?
NO
YE
S
C
heck
to m
a
k
e
s
u
re
t
hat
th
e co
rr
ect
m
odel
pl
ug
P
L
4
i
s
i
n
stal
led.
T
he
w
iri
n
g
schem
ati
c
sh
o
w
s
all v
a
lid m
o
del
plu
g
s.
Is
th
e c
o
rr
ect m
o
del
pl
u
g
i
n
stal
led?
T
he co
ntr
o
l i
s
l
o
ck
ed
out
an
d
w
ill
aut
o-
rese
t a
fte
r 1
ho
ur.
L
o
ck
out
coul
d
be
du
e
to
a
n
y
of
the fol
lo
w
in
g
:
-
F
la
m
e
s
e
n
s
e ci
rcui
t fai
lur
e.
-
G
as v
a
lv
e
rel
a
y
s
tuck
o
pen
.
-
S
oft
w
a
re che
c
k
err
o
r.
R
e
set
po
w
e
r to
cl
e
a
r l
o
ck
out.
R
e
pl
ac
e
cont
rol
i
f co
de
re
pe
ats.
YE
S
R
epl
a
c
e m
o
del
pl
u
g
P
L
4.
NO
