Bryant 312AAV/JAV - Manual (Page 53)

53
Is LED status light on? Is LED status light b
linking rapidly
without a pause? Is LED status light b
linking ON/OFF slo
w
ly
with a combination of short and long flashes? Deter
mine status code
.
The status code is a
2 digit number with the first digit deter
mined
b
y
the n
umber
o
f shor
t flashes and the second
digit b
y
the number of long flashes?
Go to section belo
w f
or the status code that
w
a
s flashed.
Is there 115V at L1 and L2? Is there 24V at SEC-1 and SEC-2? Replace fur
nace control.
Chec
k
f
o
r correct line v
oltage polar
ity
. If
units are twinned, chec
k f
o
r proper lo
w-
v
oltage (24V) transf
or
mer phasing.
T
o
recall status code br
iefly remo
v
e
and reconnect one RED wire from the
draft saf
e
guard s
w
itch to displa
y stored status code
. On RED LED control do
not remo
v
e
po
wer or b
lo
wer access panel bef
ore initiating status code recall.
Y
o
u can also recall the pre
vious status code b
y
momentar
ily shor
ting the
TEST/TWIN ter
m
inal to Com24V ter
m
inal until the LED goes out.
LED will
flash the status code of the pre
v
ious f
ault or status code #11 (1 shor
t and 1
long flash) if there w
a
s no pre
v
ious f
a
ult.
After the control repeats the code
4 times
, the control will star
t the component test sequence
. Once indicated
the control will tur
n
ON at HI HEA
T
speed.
The inducer will r
u
n f
or the entire
component test.
The HSI,
b
lo
w
er motor LO HEA
T
speed, HI HEA
T
speed, and
COOL speed will r
u
n f
o
r 10 – 15 seconds each.
Gas v
a
lv
e and humidifier will
not be tur
ned on.
W
hen the b
lo
w
er motor is tur
ned OFF the inducer will be
s
w
itched to lo
w-speed f
o
r 10 seconds
.
W
a
s there a pre
v
ious status code other
than #11?
Is door s
w
itch closed?
Is there 115V going to s
w
itch?
Replace door s
w
itch.
Replace transf
or
mer
.
Does the control respond to
W/W1,
W2,
Y1,
Y/Y2, and G (24V) ther
mostat signals?
Run system through a lo
w-heat, high-heat,
or cooling cycle to chec
k operation.
Status
codes are erased after 72 hours
. On RED
LED boards stored status codes can also be erased
whene
ver (115V or 24V) is interr
upted.
Replace fur
n
ace control.
Is door s
w
itch closed?
Is circuit break
e
r closed?
Chec
k f
or continuity in wire from circuit
break
er to fur
n
ace
.
Close circuit break
er and go bac
k to ST
AR
T
.
Chec
k room ther
mostat or
interconnecting cab
le
.
Is 24V present at
W/W1,
W2,
Y1, Y/Y2
or
G
ther
mostat ter
m
inals on the fur
n
ace control?
Disconnect all the ther
mostat wires from th
e
fur
n
ace control.
Does the prob
lem repeat when using a
jumper wire? The ther
mostat is not compatib
le with the
fur
n
ace control.
Either install a ballast resistor
,
connect the Com24V ther
mostat ter
m
inal t
o
the ther
mostat, or replace the ther
mostat.
NO YES YES
NO YES
YES
YES YES
YES YES YES
NO NO
NO NO
YES
NO
NO
NO
YES
YES
NO NO
ST
AR
T
NO
TR
OUBLESHOO
TING GUIDE
A02107A
Fig. 56 -- Troubleshooting Guide -- 2--Speed
312AA
V