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55
25
INVALID
MODEL
S
E
LECTION OR
SETUP ERROR – If
s
tat
us c
o
de 25 only
flashes 4
time
s on
pow
e
r-up the
co
ntr
ol i
s
missin
g i
ts model
pl
ug PL4
and
i
s
defaul
ting
to
the m
odel
sele
ctio
n
store
d
in
memory
. If
statu
s
code 25
fl
ashe
s
continuou
sly
it
coul
d indi
c
ate any
of
th
e
follow
ing:
-
Model plug
PL4
i
s
missin
g
and
there
i
s
no v
alid model
stor
ed in
permanen
t
memory
. This w
ill happen i
f y
o
u forge
t
to in
stall
the
model
plug PL4
on
a
serv
ice rep
lacemen
t
con
trol
.
-
Thermosta
t cal
l w
ith S
W
1-1
ON.
-
Thermosta
t cal
l w
ith S
W
1-6
ON.
-
S
W
1-1
and
S
W
1-6
both
ON.
-
Tw
o differen
t
furna
c
e mod
els tw
inned.
-
If repla
cing
a
co
ntr
ol, b
e
sure
t
o
u
s
e
corre
c
t v
e
rsion
(V#
#) lo
cated on
con
tr
ol
board) Mod
els
sup
ported
should
be
listed.
31
HIGH-HEAT PRES
SURE S
W
ITCH O
R
RELAY DI
D NOT C
L
OSE
OR
REOPENED -
Che
c
k
for:
-
Control
relay
may
be de
fectiv
e.
-
Gas v
a
lv
e is mi
sw
ired.
-
See sta
tu
s code
32
.
21
GAS HEAT
ING L
O
CKOUT – Turn
off
pow
er and w
ait 5
minute
s
to
retry
. Che
ck
for:
-
Stu
c
k close
d
ga
s valv
e relay
on con
tro
l.
-
Misw
ire
or shor
t to
g
as v
a
lv
e
w
ire.
22 ABNORMAL
FLAM
E-PROVING
S
IGN
AL
Flame is prov
ed w
hile ga
s v
alv
e is de-
energize
d
.
Indu
cer
w
ill run un
til
fa
ult i
s
cleared
. Che
c
k
for:
-
Stu
c
k
o
p
en
or
lea
k
y
g
as v
a
lv
e.
23
PRESSURE SW
IT
CH DI
D NOT OPEN –
Chec
k for:
-
Obstru
cted
pre
s
sur
e
tu
be.
- Pressure
sw
it
ch
st
u
c
k
closed.
24
SECONDARY
VOLTAGE FUSE
IS
OP
EN
Chec
k for:
-
Short ci
rcu
it in
se
co
ndary
v
oltage (2
4V)
w
iring
including
the
rmosta
t
lead
s.
Discon
nect thermo
sta
t
lead
s
to
isol
ate
shor
t cir
c
ui
t.
32
LOW
-HEAT PRESSURE SW
IT
CH DID
NOT CLOSE
OR R
E
OPENED –
If ope
n
longer
than
5
minutes, indu
c
er
shuts off
for
15 minu
te
s b
e
fo
re re
try
.
If
ope
ns
during bl
ow
er on-d
elay
period,
blow
er w
ill
come o
n
for
the
sel
e
cte
d
bl
ow
er off-del
ay
.
Chec
k for:
-
Proper v
e
nt si
zing
.
-
Low
inducer
v
oltage (115V
).
-
Low
inlet ga
s pre
s
sure (i
f L
G
PS
u
s
ed).
-
Inadequa
te
comb
u
s
tio
n
ai
r
supply
.
-
Discon
n
ected
or
ob
str
u
cted
pre
ssu
re
tubing
.
-
Defectiv
e
inducer
motor.
-
Defectiv
e
pressure
sw
itch.
-
Ex
cessiv
e
w
ind.
-
Restri
cted v
ent.
33
LI
MI
T C
IRCUI
T FAULT – Indicat
e
s t
h
e
limit, dra
ft
safe
guar
d
,
flame
rollou
t, or
blocked v
ent sw
itch
* (i
f use
d
) i
s
open
o
r
the
furn
ace
i
s
op
er
ating
in
high-hea
t o
nly
mode due
to
2
su
ccessiv
e
low
-heat limi
t
trip
s.
Blow
er w
ill run fo
r 4
min. or
un
til
open
sw
itch
remakes w
hichev
e
r i
s
lon
ger.
If open
longe
r
than
3 min.,
cod
e
chang
es
to lo
ckou
t #1
3.
If o
pen le
ss
than
3 min
.
sta
tu
s
code
#33
co
ntinue
s
to
fla
s
h
un
ti
l
blow
e
r shuts off.
Fl
ame rollou
t
sw
itch
and
BVSS r
equire
s
ma
nual re
se
t. Che
c
k
for:
-
Dirty
filter
or
re
stricted du
ct
sy
stem.
-
Loose
blow
e
r w
heel.
-
Defectiv
e sw
itch
or
conne
c
ti
ons.
-
Inadequa
te
comb
u
s
tio
n
ai
r
supply
(flame rollou
t sw
itch
open)
.
- Restri
cted
v
ent.
-
Proper v
ent si
zing
.
-
Ex
cessiv
e
w
ind.
-
Blow
er motor n
o
t o
p
erating
34
IGNIT
ION PROV
IN
G FAILURE
–
If
fla
m
e is
not sen
s
ed
durin
g the
trial for
igni
tion
period,
the con
trol
w
ill
repeat the
igni
ti
on
sequen
ce
3 mor
e
ti
mes be
fore
lo
ckout
#14
occurs.
If
flame
sig
n
al i
s
lo
st d
u
ring
th
e
blow
e
r on-delay
period, blow
e
r w
ill co
me on
for the
sele
cted
blo
w
er
off-delay
.
Che
c
k
the follow
ing
it
ems first
before pro
c
eed
ing
to the
nex
t
step
.
-
Gas v
a
lv
e turned
off.
- Manual
shut-off
v
a
lv
e.
-
Green/Y
ellow
w
ire MUST be
conne
c
te
d
to furna
c
e
sheet
m
e
tal.
-
Flame sen
s
or
must not be
groun
ded.
To
dete
rmine
w
h
ether the problem is
in
th
e
gas v
alv
e, ignite
r, o
r fl
ame
sen
s
or
the
sy
stem can
be oper
ated
in compone
n
t test
mode.
To
che
c
k
th
e igni
ter
remov
e
th
e R
thermo
sta
t conn
ecti
on
from the con
trol
,
rese
t pow
e
r, and
p
u
t
se
tup
sw
itch
S
W
1-6 in
the ON
po
si
tion to
sta
rt
th
e componen
t te
st.
Does
the
igni
ter
glo
w
orange/w
hite by
the
end o
f
the
15
se
co
nd w
a
rm-up period
?
Unplug
igni
ter
harn
e
ss from con
trol
an
d
repeat componen
t
test by
turni
ng
se
tup
sw
itch S
W
1-6
OFF and then back
ON.
Check for 1
1
5V
betw
e
en pin 3 a
n
d
NEUTRAL-L2 on
th
e co
ntro
l.
Wa
s 115
V
presen
t
for
the 1
5
second
period
?
Check conne
cti
ons and
re
try
.
If curren
t i
s
near
ty
pical
v
a
lue
(4.0-6
.0
nominal)
a
nd burne
rs
w
ill not
stay
on, rep
e
at
che
c
k
in high-h
e
at.
If bur
ners w
ill
stil
l no
t
stay
on repl
ace
control.
If b
u
rner
s
operate
in
high-hea
t then
sw
itch to
low
-
heat, che
c
k
mani
fol
d
pressure
.
If OK
,
ch
eck
burner carry
o
v
e
r
and
flame
sen
s
or loca
tion
.
Clean fl
ame
sen
s
or
w
ith fin
e
steel w
ool
and re
che
c
k
curren
t. Nominal
curren
t i
s
4.0
to
6.0 mi
croam
ps.
Is
curren
t n
ear
ty
pical v
alue?
Replace
ele
ctro
de.
Will
main
burner
s
ig
nite
and
stay
on?
Replace
fur
nace
co
ntrol
.
Fi
x
e
d.
NO
YE
S
YE
S
YE
S
NO
NO
45 CONTROL
CI
RCUI
TRY
LOCKOUT Au
to-re
s
et
afte
r 1
hour
lo
ckout due
to:
- Flame
cir
c
ui
t
failu
re
.
-
Gas v
a
lv
e relay
stu
c
k
open.
- Softw
are
che
c
k
err
o
r.
Reset pow
e
r to
cle
a
r
lockout. Repla
c
e
control
if code
repea
ts.
Replace
fur
n
ace
co
ntrol
.
Check for
con
tinui
ty
in the
harness and
igniter
.
Repla
ce
defe
ctiv
e compo
n
e
n
t.
Reconne
ct the R
th
ermostat lead
and
set
thermo
sta
t
to
c
a
ll
fo
r hea
t.
C
o
n
nec
t
v
oltmeter a
c
ro
ss ga
s v
alv
e connection
s.
Does ga
s v
a
lv
e receiv
e 24V?
Does ga
s v
a
lv
e open and
allow
gas
to
flow
?
Do the
main
burner
s ig
nite?
Do the
main
burner
s
stay
on?
Allow
blow
er to
co
me on a
nd
repeat test
to
ch
eck for
intermi
tten
t opera
ti
on.
Check that all
ga
s v
alv
es are
turned
on
.
Repla
ce
v
a
lv
e.
Check conne
cti
o
ns.
If
OK
,
replace
control.
Chec
k for:
- Inadequa
te
flame
carry
o
v
er
or rough
igni
tion
.
-
Low
inlet ga
s pre
s
sure.
- Proper
firin
g
ra
te
.
-
Blocked
or i
n
co
rrect
carry
-
ov
er gap.
(.045”
no
minal)
Repeat call
for
h
e
at
and
che
c
k flame
sen
s
or
cur
rent duri
ng trial
for
igni
tion
period.
Is
the
DC
microamp
s
bel
ow
0.5?
YE
S
YE
S
YE
S
YE
S
YE
S
NO
NO
NO
NO
NO
NO
43 LOW
-HEAT
PRESSURE
SW
IT
CH
OPEN W
H
IL
E
HIG
H
-HEAT
PRESSURE SW
IT
CH I
S
CLOSED -
Chec
k for:
-
Low
-heat
pre
s
sure sw
itch stu
c
k
open.
-
Discon
n
ected
or
ob
str
u
cted
pressure
tu
be.
- M
isw
ired
pressure
sw
itche
s
.
-
Low
inlet ga
s pre
s
sure (i
f L
G
PS
used)
.
* Blocked vent sw
itch used in Chi
mne
y
Adapt
er Kit
A14311B
Fig. 59 -- Troubleshooting Guide (Continued)