Bryant Gas Furance 315AAV - Manual (Page 58)

58
25
INV
A
LID MODEL SELECTION OR
SETUP
ERR
OR –
If sta
tus co
de 25 onl
y
flashes 4 times on po
wer-up the control
is missing its model plug
PL4 and is
def
aulting to the model
selection stored
in memor
y.
If status code 25 flashes
continuously it could ind
icate an
y of the
follo
wing:
-
M
odel plug PL4 is missing
and there
is no v
alid model stored in per
manent
memor
y.
This will happen if y
ou f
orget
to install the model plug PL4 on a ser
vice replacement contro
l.
-T
her
mostat call with SW1-1 ON.
-T
her
mostat call with SW1-6 ON.
-
SW1-1 and SW1-6 both ON.
31
HIGH-HEA
T PRESSURE SWITCH OR
REL
A
Y
DID NO
T CLOSE OR
REOPENED - Chec
k f
o
r:
-
C
ontrol rela
y ma
y be def
ectiv
e
.
-G
as v
alv
e is mis
wired.
-
S
ee status code 32.
4
1
BLO
WER M
O
T
OR F
A
UL
T
– Indica
tes the
bl
ow
er f
ailed to reach 250 RPM or th
e
bl
ow
er f
ailed to communicate wi
thin th
e
prescr
ibed time limits
.
T
hir
ty seconds
after being tur
ned ON or ten seconds
dur
ing steady
-stat
e operat
ion.
Tu
rn
p
o
w
e
r
off and chec
k the f
ollo
wing items first
bef
ore proceeding to the ne
xt step
.
-R
ubbing b
lo
wer wheel.
-
Loose b
lo
wer wheel.
-W
ir
ing from fur
nace control to b
lo
w
e
r
motor
.
Remo
v
e
the R ther
mostat connection
from the fur
nace
contr
ol, disconnect bo
th
connectors from the b
lo
wer motor PL13
and PL14.
Does the b
lo
wer wheel tur
n
freely?
Replace the b
lo
wer control module at
tached
to the b
lo
wer motor
. F
ollo
w
the instr
uctions
with the b
lo
wer control module to
mak
e sure
the entire b
lo
wer motor does not ne
ed to be
replaced. Y
ou h
av
e an open wire or bad ter
minal
on th
e
BLUE wire betwe
en the fur
nace control and
the b
lo
wer motor
.
Replace the fur
nace control.
Connect a DC v
oltmeter across PL3-4 BLU
E
(+) and PL3-2
GREEN (-).
Does the v
oltage
fluctuate as de
scr
ibed two steps
bac
k?
Does
the v
oltage fluctuate as de
scr
ibed in th
e
pre
vious step?
Replace the b
lo
wer control module attached
to the b
lo
wer motor
. F
ollo
w the instr
uctions
with the b
lo
wer control module to mak
e sure
the entire b
lo
wer motor does
not need to be
replaced.
Tu
rn po
wer bac
k on.
Is there 115V
A
C
at
PL14-5 and PL14-4? Is there
12-VDC
at PL13-7
RED
(+) and PL13-
1 GREEN (-)? Is there 12-VDC at PL3-
1 RED (+) and PL3-
2 GREEN (-)? Replace the fur
nace control.
Is th
ere 5
-VDC at PL1
3-16 YELLO
W (+)
and
PL13-1 GREEN (-)? The v
oltage just measured should be v
er
y
stab
le and should not flu
ctuate more than
.02-VDC
. If the
v
o
ltage
fluctuates
more than
this get a diff
erent v
oltmeter bef
ore
proceeding. T
u
rn
power off
, reconnect
PL13 a
nd PL14
to
the b
lo
wer motor
, then tur
n po
wer bac
k on.
Connect a DC v
oltmeter across PL3-3
YELLO
W (+) and PL3-2 GREEN (-).
Does
the v
oltage fluctuat
e more than it
did in th
e
pre
vious step?
T
u
rn
po
wer off
, disconnect PL13 and PL14
from
the b
lo
w
er
mo
tor
, then tur
n
p
o
wer
back
on.
Connect a DC
v
oltmeter across PL13-
16 BLUE (+) and PL13-1 GREE
N (-).
The
v
oltage should be
near 0-VDC b
ut it will
fluctuate br
iefly se
v
e
ral times a second.
If
y
ou h
a
v
e
an an
alog
v
o
ltmeter the
needle wil
l
br
iefly go high
se
veral
times a secon
d.
If y
o
u
ha
v
e a digital v
oltmeter with
a bar graph it
will sh
ow
a large change
in magnitude on
the b
ar graph
s
e
v
eral times
a second.
If
y
o
u
ha
v
e
a
standa
rd digital
v
o
ltmeter
it will
sh
o
w
a br
ief fluctuation in v
oltage and th
e
magnitude ma
y v
a
ry
depending on th
e
v
oltmeter used.
Y
ou ha
v
e
an open wire or ba
d ter
minal on
either the BLA
CK or
WHITE po
wer leads
between the fur
nace control and the b
lo
w
e
r
motor
. If y
ou h
a
v
e a po
wer c
hoke d
iscon
nect
it and chec
k continuity
.
Y
ou ha
v
e
an open wire or ba
d ter
minal on
either the RED or GREEN wire between th
e
fur
nace control and the b
lo
wer motor
.
Is there 5-VDC at PL3-3
YELLO
W (+) and
PL3-2 GREEN (-)? Y
ou ha
ve
an
open wire
or
bad ter
m
inal on the
YELLO
W wire between the fur
nace control
and the b
lo
wer motor
.
YES
NO NO NO YES
YES YES YES
YES YES NO NO NO
NO NO YES
YES
NO
A02108C
315AA
V