N92ESN: 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
A190092
Fig. 71 – Troubleshooting Guide
1 + 2
BLO
W
ER ON AF
T
E
R PO
W
E
R UP
–
(11
5V
OR
24V
)
–
No
rm
al o
p
e
rati
on.
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
/W
1
closed) or whe
n
(
R
-W
/W
1 opens
)
d
u
ri
n
g
t
h
e b
low
er
on
-d
e
la
y
pe
ri
od
.
6 + 1
IGN
IT
ION
LOCK
OUT
–
S
y
st
e
m
fa
iled
to
ignite
g
a
s a
nd
pr
ove
flam
e i
n
4
attem
p
ts. C
o
n
trol
w
ill
a
u
to
-r
eset
af
ter
3
hou
rs.
Ref
er
to s
tat
us c
o
d
e
#
6
.
5 ABNOR
M
A
L
F
L
A
M
E
-PROV
IN
G
S
IGN
AL
F
lam
e is
pr
ov
ed
while
gas
valv
e is
de
-
ene
rgi
z
ed.
Indu
cer
w
ill r
un
until
fa
ult is
clear
e
d
. C
heck
fo
r:
-
S
tuck
ope
n
or l
eak
y
ga
s val
v
e.
2
PRESSURE S
W
IT
CH DI
D N
O
T O
PEN
–
Check
fo
r:
- Obst
ruct
ed
pr
ess
u
re
tu
be.
-
P
re
s
su
re
sw
it
ch
s
tu
c
k c
lo
s
ed
.
3
LPS PRESSURE SWITCH DID
NOT
CLOSE OR
REOPENED
–
If
LPS
open
longer than five minutes, inducer shuts off
for 15 minutes before retry.
Check fo
r:
-
Excessive wind
- Proper vent sizing
- Defective inducer motor
- Low inducer voltage (115VAC)
- Defective pressure switch
- Inadequate combustion air supply
- Disconnected or obstructed pressure
t
u
b
in
g
- Low inlet gas pressure (if LGPS used)
- Restricted vent
- Condensate drainage restricted or
blocked.
If it opens during blower on-delay period,
blower will come on for the selected
blower off-delay.
4 L
IM
IT
C
IRCU
IT
F
A
ULT
–
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
pen
s
w
itc
h
r
e
m
a
k
e
s
w
h
ic
h
e
v
er
i
s
lo
n
g
e
r.
If
o
p
e
n
l
o
ng
er
th
an
3
mi
n
, c
o
de
ch
an
ge
s
to
l
o
c
k
o
ut
#7
.
If
ope
n
less t
han
3 m
in
. st
atus
co
de
#4
con
tin
u
e
s
to fla
s
h
until
blo
wer
sh
uts
off.
Fl
am
e
rollo
u
t s
w
it
ch
re
qui
res m
a
nu
al r
e
se
t.
Check
fo
r:
- Loo
se
blo
wer
whe
el.
- Defec
tive
s
w
itch
o
r
co
nn
ectio
ns.
-
Dirt
y
filt
er
o
r r
e
str
ic
te
d
d
u
ct s
y
ste
m
.
-
Im
p
ro
per
g
a
s in
put
a
d
justm
e
nt
-
Im
p
ro
per
lim
it s
w
itc
h
o
r n
o
lim
it g
a
sk
et.
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
gnit
e
r,
or
flam
e
sen
s
o
r t
he
s
y
stem
c
a
n
be
op
er
ate
d
in
com
p
one
nt
test m
o
de.
T
o
c
h
eck
th
e ig
nite
r,
rem
o
v
e
the R
th
erm
o
s
tat
co
nne
ctio
n fr
om
th
e
cont
rol,
re
set po
wer
,
st
art the
com
p
on
e
n
t
test.
Do
es t
he i
gnit
e
r
glo
w
o
ran
ge
/w
hit
e
b
y
th
e
end
of
th
e 1
5
s
e
co
nd
warm
-u
p
peri
od
?
Unplu
g ig
nit
e
r
har
ne
ss f
rom
co
nt
rol
and
rep
eat
com
p
on
ent
t
e
st
. Ch
e
c
k f
o
r 1
1
5V
bet
wee
n
co
nn
ect
o
r P
2
(HS
I) a
n
d
NE
UT
RA
L-
L
2
o
n
t
h
e c
o
nt
rol
.
W
a
s 1
1
5
V
pres
en
t fo
r t
he
15
sec
o
n
d
p
e
ri
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
μ
A
DC
nom
in
al)
an
d
bur
ne
rs
w
ill
not
sta
y
o
n
,
repl
ace
co
ntr
o
l.
Clean
flam
e
se
nso
r
w
it
h
fin
e
st
eel
wool
a
n
d r
ec
h
ec
k c
u
rr
e
nt
. N
o
mi
n
a
l
c
u
rr
en
t i
s
4.0 to 6.0
μA
D
C
.
Is
cu
rre
nt
ne
ar
ty
pic
a
l v
a
lue
?
Repla
ce elect
ro
d
e.
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
Y
ES
Y
ES
Y
ES
NO
NO
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
gnit
er.
Re
plac
e
def
ective
com
p
on
ent
.
Reco
n
n
e
ct t
he
R th
erm
o
s
tat
lea
d
and
s
e
t
th
e
rm
o
sta
t to
ca
ll
fo
r h
e
at.
Co
nn
ect
voltm
e
te
r acr
oss gas valv
e
co
nn
ecti
ons
.
Does gas
valv
e
re
c
e
ive 24V
?
Does
gas
valv
e
ope
n a
n
d
allo
w g
a
s t
o
flo
w
?
Do th
e m
a
in
b
u
rner
s ig
nite
?
Do th
e m
a
in
b
u
rner
s st
a
y
o
n
?
A
llow blo
wer
to
com
e
on
an
d
rep
eat
tes
t t
o
ch
eck
for
interm
itt
en
t o
p
e
rati
on.
Check
th
at
gas
valv
e el
ectri
c
sw
it
ch is
tu
rn
ed on.
Re
plac
e
valve.
Che
ck
co
nn
ectio
n
s. I
f OK,
repl
ace
co
ntr
o
l.
Check
fo
r:
- Ina
deq
ua
te
fl
am
e
c
a
rr
y
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
.
Repe
at c
a
ll f
o
r
he
at
and
ch
eck
flam
e
sens
or c
u
rr
e
n
t
duri
n
g
trial
fo
r ig
nitio
n
peri
od.
I
s
t
h
e DC
c
u
rr
en
t b
e
lo
w
0.5
μ
A
?
Y
ES
Y
ES
Y
ES
Y
ES
Y
ES
NO
NO
NO
NO
NO
NO
6 IGN
IT
ION
P
ROV
IN
G
F
A
IL
URE
–
If
f
la
m
e
i
s
not s
e
n
s
ed
d
u
rin
g
t
he
trial
fo
r ig
nitio
n
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
#
6 +
1 occ
u
rs
.
If flam
e
sig
n
al is
lost
du
rin
g
t
h
e
b
low
er
o
n
-d
e
lay
pe
ri
o
d
, b
low
e
r
w
ill
co
me
on
for
th
e
sel
e
cte
d
blo
w
er off-
del
a
y
.
Ch
ec
k
th
e fo
llo
w
ing
be
for
e
goin
g t
o
t
he
ne
xt st
ep.
- Gas
v
a
lve
tu
rn
ed
off
.
-
Man
ual
sh
ut-
o
ff v
a
lve
o
p
en
?
-
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
tal.
-
Flam
e s
e
n
s
or
m
u
st
not
be
gr
ou
nd
ed.
10
P
O
LA
R
IT
Y
–
Che
ck
for
c
o
rr
ec
t
lin
e
volta
ge pol
arit
y
.
I
f
u
n
its are
t
w
in
ne
d,
check
fo
r p
ro
p
e
r lo
w
-volt
ag
e (
24V
)
tra
n
sfo
rm
e
r ph
asin
g.
7 L
IM
IT
C
IRCU
IT
LOCKOUT
–
L
o
ck
out
occu
rs if
th
e lim
it, flam
e
r
o
llou
t is
ope
n
lon
g
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
. R
e
fe
r t
o
st
atus
co
d
e
#4.
8 GAS
HEAT
IN
G
L
O
CKOUT
–
Co
ntr
o
l
w
ill
NOT
a
u
to
r
es
et. T
u
rn
off
p
o
w
e
r a
nd
wait
5 m
inut
e
s t
o
r
e
tr
y
. C
heck
f
o
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
.
Y
ES
9
HPS PRESSURE
SWITCH DID NOT
CLOSE OR REOPENED
- If HPS remains
open
for one minute
after
gas valve closes (after
three succesive
trials), then furnace control
will
lockout for
3
hours before
retry. See Code 3 for
troubleshooting.
