19
25 INVALID
MODEL
S
ELECTION
OR
SETUP ERROR – If
s
tat
us c
o
de 25 only
flashes 4
time
s on
pow
er-up the
co
ntr
ol i
s
missin
g i
ts model
pl
ug PL4
and
is
defaul
ting
to
the
m
odel sele
ctio
n store
d
in
memory
. If
statu
s code 25
flashe
s
continuou
sly
it
coul
d indi
cate any
of
th
e
follow
ing:
-
Model plug
PL4
is
missin
g and
there
is
no v
alid model
stor
ed in
permanen
t
memory
. This w
ill happen i
f y
ou 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
ce mod
els tw
inned.
-
Serv
ice repla
ceme
nt
con
trol
doe
s n
o
t
recogni
ze
new
model plug
s HK
70EZ01
7
thru
HK70EZ021
. Need
board
softw
are
v
ersion V12
or l
ater
.
31
MEDI
UM-HEAT PRESSURE SW
IT
CH
OR
HPSR RELAY DI
D
NOT CLOSE
OR
REOPENED -
Che
ck
for:
-
HPSR relay
may
b
e
de
fectiv
e.
-
See sta
tu
s code
32
.
41
BLO
WER MOTOR
FAULT – Indicate
s
the
blow
er failed
to
rea
ch 2
5
0 RPM
or
the
blow
er failed
to
co
mmunicate
w
ithin
the
prescribed
time limi
ts.
Thir
ty
seconds
afte
r
bei
ng turne
d
ON
or ten
seco
nds
during steady
-sta
te
opera
tion
.
Turn
po
w
er
off and
check the
fo
llow
ing items first
before
pro
ceedin
g
to th
e nex
t
step.
-
Rubbing blow
er w
heel.
-
Loose
blow
er
w
heel.
-
Wiring
from furna
ce
con
trol
to
b
low
er
motor.
Remo
v
e
the
R
ther
mosta
t
con
nection
from
the furn
ace
control,
disconn
ect both
conne
ctors
from
th
e blow
er motor
PL1
3
and PL14
. Doe
s
th
e blow
er w
heel turn
freely
?
Replace
the
blow
er con
trol
module
a
ttached
to
the blow
er
motor
. Follow
the
in
str
ucti
ons
w
ith
the blow
er
con
trol
module to
ma
ke
su
re
the
entire
blow
er motor
doe
s no
t need
to
b
e
replaced
.
Turn pow
er back o
n
. Is th
ere
115VAC
at
PL14-5 and PL14-4
?
Y
o
u hav
e an open
w
ire or bad
terminal
on eith
er the
BLACK
or
W
H
ITE
pow
er lead
s be
tw
een
the furn
ace
control and the
blow
er motor.
If y
ou hav
e a
pow
er choke di
sco
nnect i
t
and
che
ck conti
nuity
.
YE
S
YE
S
NO
NO
Is there
12-VDC a
t
PL13-1 RED
(+)
an
d
PL13-4 GREEN
(-
)?
YE
S
NO
Is there
12-VDC a
t
PL3-1 RED
(+) a
n
d
PL3-2 GREEN
(-)
?
Replace
the
furna
ce co
ntro
l.
NO
Y
o
u hav
e an open
w
ire or bad
terminal
on eith
er the
RED
or
GREEN w
ire betw
een the
furna
ce
con
trol
and
the
blow
er
mot
or.
Y
ES
Is there
5-VDC a
t
P
L13-2 Y
E
LLO
W
(+)
and PL13
-4
GREE
N (-)?
Is there
5-VDC a
t
P
L
3-3
Y
ELLO
W
(+
) and
P
L3-2
GREEN (-)?
NO
NO
Y
ou hav
e an open
w
ire or bad
terminal
on
the
Y
ELLO
W w
ire
betw
een the
furna
ce co
ntro
l and
the blow
er
motor
.
YE
S
YE
S
The v
oltage ju
st me
asured
should
be
v
e
ry
stable and sho
uld
no
t flu
ctu
a
te
mo
re
than
.02
-VDC.
If th
e v
oltage
flu
ctua
te
s
more th
an
thi
s g
e
t
a differe
nt v
oltmete
r
before
pro
ceedin
g.
Turn pow
e
r off, di
sconne
ct PL1
3 and
PL14 from the
blow
er
moto
r,
then turn
pow
er back on
. Co
nnect a
DC v
oltmeter
acro
ss PL1
3-3
BLUE (+)
and
PL13-4
GREEN (-)
. The v
oltage
sh
ould
be ne
a
r
0-VDC but i
t w
ill flu
ctua
te
brie
fly
sev
eral
times a
se
cond
.
If
yo
u ha
v
e
an analo
g
v
oltmeter the ne
edl
e
w
ill briefly
go
high
sev
eral time
s a
se
cond.
If y
o
u hav
e
a
digital
v
oltmeter
w
ith a
bar
graph
it w
ill
show
a larg
e
chang
e in ma
gnitu
de o
n
the
bar grap
h
sev
eral ti
mes a
seco
nd.
If y
o
u
hav
e
a standard
di
gital
v
oltmeter i
t w
ill
show
a brie
f flu
ctua
tion
in v
oltage
and
the
magnitude
may
v
a
ry
depending on
th
e
v
oltmeter u
sed.
Does
the
v
oltage
fluctu
ate
a
s d
e
scribe
d in
the
prev
ious step?
Connect a
DC v
o
ltmeter a
cro
ss
PL3-4
BLUE
(+) and
PL3-2
GRE
EN (-)
. Does
the v
oltage
fluctua
te
as de
scrib
ed tw
o
step
s ba
ck?
Y
ou hav
e an open
w
ire or bad
termina
l on
the
BLUE w
ire betw
een th
e
furna
ce
con
tr
ol and
th
e
blow
er motor.
NO
Replace
the
furna
ce co
ntro
l.
YE
S
Turn pow
e
r off, re
connect
PL13
and
PL14 to the
blow
er motor, then turn
pow
e
r back on
. Co
nnect a
DC v
oltmeter
acro
ss PL3
-3 Y
E
LL
O
W
(+)
and
PL3-2
GREEN
(-)
.
Doe
s the
v
oltage flu
ctu
ate
more th
an i
t did
in
the prev
ious
step?
NO
YE
S
YE
S
NO
Replace
the
blow
er con
trol
module
a
ttached
to
the blow
er
motor
. Follow
the
in
str
ucti
ons
w
ith
the
blow
er con
trol
module
to ma
ke
su
re the
entire
blow
er motor
doe
s no
t need
to
b
e
replaced
.
42
IN
DUCER MOTOR FAULT –
Indic
a
te
s t
h
e
inducer
motor h
a
s
not
star
ted w
ithin
2
0
seconds a
fte
r a
call
for
hea
t,
the
indu
cer
motor RPM
is ou
tsi
de its v
alid range
of
operatio
n
, or
the
in
ducer
RPM
signal
w
a
s
lost for 5 se
cond
s
d
u
ring
op
erati
o
n.
Chec
k for:
-
Proper
v
e
nt
si
zing
.
-
Failed
indu
cer
motor.
-
Restri
cted
combu
stion
air
supply
.
-
Improper
moto
r
w
iring.
A07583
58MV
C
