SERVICE AND TECHNICAL SUPPORT MANUAL
Gas Furnace: (F/G)9MAE
Specifications subject to change without notice.
440 04 4700 00
33
Figure 16 (CONT.) Troubleshooting Chart
−
Flow Chart
4
+
1
B
LO
W
E
R
M
OT
OR
F
A
ULT
–
Indic
a
tes
th
e
b
lo
w
e
r
fa
ile
dt
or
e
a
c
h2
5
0
R
P
Mo
r
th
e
b
lo
we
r
fa
ile
d
to
c
o
m
m
u
n
ica
te
w
it
h
in
th
e
p
re
scr
ib
e
d
tim
e
lim
its.
T
h
ir
ty
seco
nds
a
ft
er
bei
ng
tur
n
e
d
O
N
o
r
te
n
s
e
c
o
n
d
s
d
ur
in
g
s
te
ady
-s
ta
te
op
er
a
ti
o
n
.
T
u
rn
po
wer
o
ff
an
d
c
h
e
ck
th
e
foll
o
w
in
g
it
em
s
fi
rs
t
b
e
fo
re
pr
oce
e
di
ng
to
th
e
n
e
x
t
step.
-
R
ubbi
ng
bl
o
w
er
w
h
eel
.
-
Loo
se
bl
o
w
er
w
h
e
e
l.
-
W
ir
in
g
fr
o
m
fur
na
ce
c
ont
rol
to
b
lo
w
e
r
mo
to
r.
Rem
o
ve
th
e
R
th
e
rm
o
sta
t
co
nn
ecti
on
from
th
e
fur
nac
e
c
o
nt
rol
,
di
sc
on
nect
bot
h
c
o
n
n
e
ct
ors
from
the
bl
o
w
er
m
o
to
r
P
L13
an
d
P
L
1
4.
D
o
es
th
e
b
lo
w
e
r
w
h
e
e
l
tur
n
fr
eel
y
?
R
epl
a
c
e
the
bl
o
w
er
co
ntr
o
l
m
od
ul
e
a
tt
a
c
he
d
to
th
e
b
lo
w
e
r
m
o
to
r.
F
o
llo
w
th
e
in
s
tr
u
c
tio
n
s
w
ith
the
b
lo
wer
c
on
tr
ol
m
o
d
u
le
to
m
a
k
e
s
u
re
the
enti
re
b
lo
w
e
r
m
ot
or
do
es
not
n
e
e
d
to
b
e
repl
ace
d
.
T
u
rn
po
w
e
r
b
ack
o
n.
Is
th
er
e
1
15V
A
C
at
P
L
1
4
-5
a
n
d
P
L1
4-
4
?
Y
o
uh
a
v
ea
no
p
e
n
w
ir
eo
rb
a
d
te
rm
in
a
l
on
e
ith
er
th
e
B
L
A
C
K
or
W
H
IT
E
pow
er
le
a
d
s
b
et
w
een
the
fur
nac
e
c
ont
rol
a
n
d
th
e
bl
o
w
e
r
m
o
to
r.
If
y
o
u
h
ave
a
po
w
e
r
c
hok
e
d
isco
nn
ect
it
a
n
d
c
h
e
c
k
c
on
ti
nu
it
y
.
YE
S
YE
S
NO
NO
Is
th
er
e
1
2-V
D
C
a
t
P
L1
3-1
R
E
D
(+
)
a
n
d
PL
1
3
-4
G
R
EEN
(-
)?
YE
S
NO
Is
th
er
e
1
2-V
D
C
a
t
P
L3
-1
R
E
D
(+
)
a
n
d
PL
3
-2
G
REEN
(-
)?
R
e
pl
a
c
e
the
fu
rn
ace
c
on
trol
.
NO
Y
o
uh
a
v
ea
no
p
e
n
w
ir
eo
rb
a
d
term
in
al
o
n
ei
th
e
r
th
e
R
E
D
or
G
R
EEN
w
ir
e
b
e
tw
e
e
n
th
e
fur
n
ac
e
c
o
n
tr
ol
and
th
e
bl
o
w
e
r
mo
to
r.
YE
S
Is
th
er
e
5
-V
D
C
a
t
P
L
13
-2
Y
E
L
L
O
W
(+
)
and
P
L1
3-
4
G
R
E
E
N
(-
)?
Is
th
e
re
5
-V
D
C
a
t
P
L
3
-3
YE
L
L
O
W
(+
)
a
n
d
P
L
3
-2
G
R
EEN
(-
)?
NO
NO
Y
o
uh
a
v
ea
no
p
e
n
w
ir
eo
rb
a
d
term
in
al
o
n
th
e
Y
E
L
LO
W
w
ire
bet
w
ee
n
th
e
fu
rn
ac
e
c
o
n
tr
ol
an
d
the
b
lo
wer
m
o
tor
.
YE
S
YE
S
T
h
e
v
ol
tag
e
ju
st
m
e
asu
red
sh
oul
d
b
e
ver
y
sta
b
le
an
d
s
h
oul
d
n
ot
fl
uct
u
at
e
m
o
re
tha
n
.0
2-V
D
C
.
If
th
e
v
olta
ge
fluct
u
at
es
mo
re
th
an
th
is
ge
t
a
d
iff
er
e
n
t
v
o
lt
m
e
ter
bef
o
re
pr
oc
eedi
n
g
.
T
u
rn
po
w
e
r
o
ff,
di
sc
on
nect
P
L
1
3
and
P
L
14
fr
om
the
b
lo
w
e
r
m
oto
r,
the
n
tur
n
po
w
e
r
b
ack
o
n
.
C
o
n
n
ect
a
D
C
vol
tm
e
te
r
acro
ss
P
L
13
-3
B
L
U
E
(+
)
a
nd
P
L
1
3
-4
G
R
E
E
N
(-
).
T
h
ev
o
lt
a
g
e
s
h
o
u
ldb
en
e
a
r
0-V
D
C
b
ut
it
w
ill
fl
uct
u
at
e
b
ri
efl
y
se
ver
a
l
ti
me
s
a
se
c
o
n
d
.
If
y
ou
ha
v
e
a
n
an
a
log
vo
ltm
e
te
r
th
e
n
e
e
d
le
w
ill
b
rie
fl
y
g
o
h
ig
h
seve
ral
ti
m
e
s
a
s
ec
on
d.
If
y
o
u
hav
e
a
d
ig
it
a
l
v
o
lt
m
et
er
w
it
h
a
b
ar
gr
ap
h
it
w
ill
s
h
ow
a
lar
ge
ch
a
n
g
e
in
mag
n
it
u
d
e
o
n
th
e
b
a
r
g
ra
ph
se
v
e
ra
l
ti
m
es
a
s
e
c
o
n
d
.
If
y
o
u
h
a
v
e
a
s
ta
n
d
a
rd
d
ig
it
a
l
v
o
ltm
e
te
r
it
w
ill
s
h
ow
a
b
ri
ef
fl
uc
tu
a
ti
o
n
in
v
o
lta
ge
an
d
th
e
m
a
gni
tude
m
a
y
v
ar
y
d
e
p
e
ndi
ng
on
the
voltm
e
te
r
u
se
d.
D
oes
the
v
ol
ta
g
e
fl
uctu
at
e
a
s
d
e
scri
b
e
d
in
th
e
previ
o
u
s
st
ep?
C
onn
ect
a
D
C
vol
tm
e
te
r
a
c
ros
s
P
L
3
-4
B
L
U
E
(+
)
and
P
L
3
-2
G
R
E
E
N
(-
).
D
o
es
th
e
v
o
ltag
e
fl
uctu
at
e
a
s
d
e
scri
b
e
d
tw
o
s
te
ps
back
?
Y
o
u
h
av
e
a
n
o
pe
n
w
ir
e
o
r
b
ad
te
rm
in
al
on
th
e
B
L
U
E
w
ire
be
tw
ee
n
the
fu
rn
a
c
e
c
on
tr
o
l
a
n
d
the
b
low
er
mo
to
r.
NO
R
epl
a
c
e
the
fu
rn
ace
c
on
trol
.
YE
S
Tu
rn
p
o
w
e
r
o
ff
,
re
c
o
nn
ec
t
P
L1
3
a
nd
P
L
14
to
the
b
lo
w
e
r
m
oto
r,
the
n
turn
po
w
e
r
b
ack
o
n
.
C
o
n
n
ect
a
D
C
vol
tm
e
te
r
acro
ss
P
L
3-
3
Y
E
L
LO
W
(+
)
an
d
P
L
3
-2
GR
E
E
N
(-).
D
o
es
th
e
v
ol
tage
fl
uc
tua
te
m
o
re
th
a
n
it
di
d
in
the
pr
evi
o
us
st
ep
?
NO
YE
S
YE
S
NO
R
epl
a
c
e
the
bl
o
w
er
co
ntr
o
l
m
od
ul
e
a
tt
a
c
he
d
to
th
e
b
lo
w
e
r
m
o
to
r.
F
o
llo
w
th
e
in
s
tr
u
c
tio
n
s
w
ith
the
b
lo
wer
c
on
tr
ol
m
o
d
u
le
to
m
a
k
e
s
u
re
the
enti
re
b
lo
w
e
r
m
ot
or
do
es
not
n
e
e
d
to
b
e
repl
ace
d
.
9
M
ED
IU
M
P
RESSURE
S
W
IT
CH,
H
IGH
PRESSURE
S
W
IT
CH
O
R
PSR
REL
A
Y
DI
D
N
O
T
C
L
O
S
E
O
R
R
EO
PENED
-
C
heck
fo
r:
-
P
S
R
rel
a
y
m
a
y
be
def
ecti
v
e
.
-
R
efe
r
to
st
atus
co
de
#3.
10
P
O
LA
R
IT
Y
–
C
he
ck
for
c
or
rec
t
lin
e
vo
lta
g
e
p
o
la
rit
y
.
If
u
n
its
a
re
tw
in
n
e
d
,
c
h
e
c
k
for
pr
op
er
lo
w
-v
o
lt
a
g
e
(2
4
V
)
tr
an
s
for
me
r
p
ha
s
ing
.
7
L
IM
IT
C
IRCU
IT
L
O
CKOUT
–
L
o
ck
o
u
t
o
ccu
rs
if
th
e
lim
it
o
r
fla
m
e
ro
ll
o
u
t
s
w
itc
h
is
ope
n
lo
ng
er
tha
n
3
m
in
ut
es
or
10
succe
ssive
lim
it
tr
ip
s
o
c
c
ur
re
d
d
ur
in
g
ma
x
imu
m-h
ea
t.
C
o
nt
ro
l
w
ill
au
to
-r
e
s
et
afte
r
3
ho
ur
s.
R
e
fe
r
to
s
ta
tu
s
c
o
d
e
#
4
.
8
G
AS
HEATI
N
G
L
O
C
KO
UT
–
C
o
n
tr
o
l
w
ill
N
O
T
a
u
to
re
s
e
t.
T
ur
n
o
ff
pow
er
an
d
w
a
it
5
m
in
ut
es
to
re
tr
y
.
C
heck
for:
-
S
tuck
close
d
g
a
s
v
alve
re
la
y
o
n
c
on
tr
ol.
-
M
is
w
ir
e
o
r
s
hor
t
to
g
as
v
a
lv
e
B
LU
E
w
ir
e.
4
+
2
IND
UCER
M
OT
OR
F
A
UL
T
–
In
d
ic
a
te
s
the
ind
uce
r
m
o
to
r
has
no
t
s
ta
rt
ed
w
ithi
n
2
0
se
c
o
n
d
s
a
fte
r
a
ca
ll
fo
r
h
ea
t,
th
e
induc
er
m
o
to
r
R
P
M
is
o
u
tsi
d
e
its
v
a
lid
ra
ng
e
o
f
o
pe
ra
ti
on
,
o
r
th
e
in
du
c
e
r
R
P
M
si
gnal
w
a
s
lost
fo
r
5
s
ec
on
ds
d
u
ri
ng
ope
rati
o
n.
C
h
eck
fo
r:
-
P
rop
e
r
v
en
t
s
iz
in
g.
-
F
ai
le
d
indu
cer
m
oto
r.
-
R
e
s
tr
ic
te
d
c
o
m
b
u
s
tio
n
a
ir
s
u
p
p
ly
.
-
Impr
o
p
e
r
mo
to
r
w
ir
in
g.
4
+
3
L
O
W
O
R
M
E
D
IU
M
PRESSURE
S
W
IT
CH
O
PEN
W
H
IL
E
M
ED
IU
M
O
R
HIGH
PRESSURE
S
W
IT
CH
IS
CL
O
SED
-
C
h
e
c
k
fo
r:
-
Lo
w
o
r
M
e
d
p
res
s.
s
w
it
ch
stuck
o
pe
n.
-
D
iscon
nec
ted
o
r
o
bstr
uct
e
d
p
re
ssu
re
tubi
ng.
-
Im
p
ro
per
p
ress
u
re
s
w
it
c
h
w
iri
ng
.
-
L
ow
in
le
t
g
as
pr
e
s
su
re
(i
f
L
G
P
S
use
d
).
-
P
lugg
ed
c
o
n
d
e
n
sa
te
drai
n.
-
W
ater
in
ven
t
pi
pi
n
g
,
p
ossi
bl
e
s
ag
gi
n
g
pi
pe
.
