915SB: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
64
A190093
Fig. 72 – Troubleshooting Guide (Cont)
11
NO
PRE
V
IOUS
CODE
–
S
tor
ed
co
d
es
a
re
eras
ed
aft
e
r 72
h
o
ur
s.
Run
s
y
st
em
thr
o
ug
h a
h
eati
ng or cooli
ng c
y
cle
to
check
s
y
st
em
.
12
BLO
W
ER ON AF
TER PO
W
E
R UP
–
(11
5V
OR
24V
)
–
No
rm
al o
p
e
rati
o
n.
Blower
r
u
ns f
o
r 90
se
c
o
n
d
s, if
u
n
it is
po
w
e
re
d u
p
duri
ng
a c
all f
or
hea
t (R
-W
close
d
)
or
whe
n
(
R
-W
opens
) d
u
ri
ng t
h
e
blo
w
e
r on-
del
a
y
p
eri
od.
1
3
LI
M
IT
C
IR
C
U
IT
L
O
C
K
O
U
T
–
L
o
ck
out
occu
rs
if
th
e lim
it or
flam
e
r
o
ll
out
is o
p
e
n
long
er
th
a
n
3
m
inu
te
s.
Co
ntr
o
l w
ill aut
o
-
rese
t a
fte
r 3
ho
urs
. Se
e c
od
e 3
3
.
1
4
I
G
N
IT
IO
N
L
O
C
K
O
U
T
–
S
y
st
e
m
fa
il
ed
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.
See
statu
s
co
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
for:
-
Stuck
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
.
22
ABNOR
M
A
L
FLA
M
E
-PROV
IN
G
S
IGN
AL
F
lam
e is
pr
ov
ed
while
gas
valv
e is
de
-
ene
rgi
zed.
Indu
cer
w
ill r
u
n
until
fa
ult is
clear
e
d
. C
h
eck
fo
r:
-
S
tuck
ope
n
or l
eak
y
ga
s val
v
e.
23
PRE
S
SURE S
W
IT
CH DI
D N
OT
OPEN
–
Check
fo
r:
- Obst
ruct
ed
pr
ess
u
re
tu
be.
-
Press
ure
s
w
itc
h
st
uck
close
d
.
24
SECONDAR
Y
VOL
T
AGE
F
US
E
I
S
OP
EN
Check
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
nec
t th
erm
o
stat
lea
d
s t
o
is
olat
e
shor
t cir
c
uit.
31
HP
S PRESSURE
SWITCH DID
NOT
Check for:
- Excessive wind
- Restricted
vent
-
Defective
inducer
motor
-
Low
inlet gas prssure (if LGPS used)
-
Defective
pressure
switch
-
Low
inducer
voltage (115VAC)
-
Inadequate
combustion
air
supply
-
Proper
vent
sizing
-
Disconnected
or
obstructed
pressure
tubing
- Condensate
drainage
restricted
or
blocked
If it opens during blower on-delay period,
blower will come on for the selected blower
off-delay
3
3
LI
M
IT
C
IR
C
U
IT
F
A
U
L
T
–
I
n
dica
te
s the
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
eve
r is l
o
ng
er
.
If
op
en
lon
ge
r t
h
a
n
3
mi
n
, c
o
de
ch
an
ge
s
to
l
o
c
k
o
ut
#7
.
If
ope
n
less t
h
an
3 m
in
. st
atus
co
de
#4
con
tin
u
e
s
to fla
s
h
until
blo
w
er
sh
uts
off.
F
lam
e
rollo
ut s
w
it
ch
re
qui
res m
a
nu
al r
e
se
t.
Check
fo
r:
-
Loo
se
blo
w
er
whe
e
l.
-
Defec
tive
s
w
itch
o
r co
nn
ectio
n
s.
-
Dirt
y
filt
er
or
r
e
str
ic
te
d
d
u
ct s
y
stem
.
-
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
lim
it g
a
sk
et.
34
IGN
IT
ION
P
ROV
IN
G
F
A
ILURE
–
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
ont
rol
w
ill
re
pe
at t
he i
gniti
o
n
seq
u
en
ce
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
wer
w
ill
c
o
m
e
on
fo
r the
sel
e
ct
ed blo
wer 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
.
-
Gas v
a
lve
tu
rn
ed
off.
- Man
ual
sh
ut-
o
ff
v
a
lve
.
- Gre
en/
Y
el
lo
w
w
ire
M
U
S
T
be
c
o
n
nect
ed
to f
u
rn
ace
sh
eet
m
e
tal.
-
Flam
e s
en
s
or
m
ust
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, i
g
nit
e
r,
or
flam
e
sen
s
o
r t
h
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
er.
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
?
Check
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
urn
er
s
w
ill
not
sta
y
o
n
, r
epl
ace
cont
rol.
Clean
flam
e se
nso
r w
it
h
fin
e
st
eel wool
and
r
e
che
c
k
curr
en
t. N
o
m
inal
cur
re
n
t i
s
4.0 to 6.0
m
ic
ro
am
ps.
Is
cu
rre
nt
ne
ar
ty
pic
al v
a
lue
?
Repla
ce elect
ro
de.
W
ill m
a
in bur
ner
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
LOCKOUT
A
u
to
-r
eset
afte
r 1
ho
ur
lock
out
d
ue
to:
- Flam
e
ci
rcui
t
fail
ur
e.
-
G
a
s
va
lv
e r
e
la
y
st
u
c
k
ope
n.
- Soft
w
a
re
che
c
k
err
or.
Reset
po
wer
to
cle
a
r
lock
ou
t. R
epl
ace
co
nt
rol if
co
de
re
pea
ts.
Unplu
g
ig
nit
e
r
har
ne
ss f
rom
co
nt
rol
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
ective
com
p
on
ent
.
Reco
nn
ect t
h
e
R th
erm
o
s
tat
lea
d
and
s
e
t
the
rm
o
sta
t to
call
for
h
e
at.
Co
nn
ect
voltm
e
te
r acr
oss gas valv
e
co
nn
ecti
ons
.
Does
gas
valv
e r
e
c
e
ive
24V
?
Does gas
valv
e ope
n
a
n
d
allo
w
g
a
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
?
Allow 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.
Check
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
Check
fo
r:
-
Ina
deq
ua
te fl
am
e c
ar
ry
ov
er
or rou
gh
igni
tion
.
-
Lo
w
i
n
let
ga
s p
ress
u
re
.
- Prop
er
firin
g
r
a
te
.
CLOSE
OR REOPENED
–
If
HPS
remains
open for one minute after gas valve closed
(after three succesive trails), then furnace
control will lockout for 3 hours before retry.
3
2
L
P
S
P
R
E
S
S
U
R
E
S
W
IT
C
H
D
ID
N
O
T
C
L
O
S
E
O
R
R
E
O
P
E
N
E
D
-
If
LPS
open
longer
than
five
minutes,
inducer shuts
off
for
15 minutes before retry. See
Code 31
for
troubleshooting.
