Bryant 355MAV - Manual (Page 15)

A02350a
T
roub
leshooting
Guide –
V
ar
iab
le Sp
eed
ST
AR
T
Is AMBER
LED
stat
us light on?
Is there
24V
at SEC-1 and
SEC-2?
Is there
115V
at L1
and L2?
Replace furnace
co
ntrol.
Is
door
s
w
itch clo
se
d?
Replace
tr
a
n
sf
or
mer
.
Replace door s
w
itch.
Is there 115V going to
s
w
itch?
Is
circuit brea
k
e
r closed?
NO
YES YES
Chec
k f
o
r
con
tin
u
ity
in wire from
cir
cui
t
break
er
to fur
na
ce
.
Close
cir
cui
t break
er and
go bac
k
to
ST
AR
T
.
Is AMBER
LED
status
light b
lin
king
rapidly w
ithout a pause?
Chec
k f
o
r
corr
ect li
ne v
o
ltage polar
ity
.
If
units
ar
e tw
inned, chec
k f
o
r
proper
lo
w-
v
o
ltage (24V) transf
or
mer phasing
.
YE
S
NO YE
S
Is AMBER
LED
status
light b
lin
king
ON/OFF
slow
ly
wi
th
a
c
ombinat
ion of
shor
t and long
fla
sh
es?
Deter
mine status
code
.
The
status
c
o
d
e
is a 2 digit number
w
ith the first digit
deter
mined
b
y
the
n
umber of
shor
t
flashes and
the
se
cond digi
t b
y
the
n
umber o
f long
fla
shes?
NO
YE
S
T
o
reca
ll pre
v
ious
statu
s codes discon
nect
the R
ther
mo
sta
t
conn
ecti
on,
rese
t po
w
e
r,
an
d put
setup
s
w
itch
S
W
1-1
in
th
e ON posi
tion.
T
h
e
AMBER LED
w
ill
flash
th
e statu
s code
s
in
the order
of
o
c
curren
ce
.
Record
status code
s
u
n
til
sta
tu
s code
#11 flashes
(1
shor
t and 1 long flash)
.
After
sta
tu
s
c
o
de #11
flashes the statu
s
codes
w
ill repeat.
S
tatus
code
s
are er
a
s
ed
after
72
hours or
can be man
ually er
ased
b
y
putting setup
s
witch
SW1-
1 in the
O
N
position
and jumper
ing R
,
W/W1
, and
Y
/Y
2
sim
ultaneously
until
sta
tus
code
#1
1 is
flashed.
When
done
put
setup
s
w
itch SW1-
1 in
the
OFF posi
tio
n.
Wa
s
there
a pre
v
ious
statu
s code othe
r
than
#11?
Go
to
se
ctio
n belo
w
f
or th
e
status code
that was
fla
shed
.
NO
YES
Does
the
control
respond
to
W/W1
,
W2,
Y
1
,
Y
/Y
2
, and G (24V)
thermosta
t
signals? Run sy
stem
throug
h a low
-heat, high-
heat,
or
cooling
cy
cle
to
che
ck
oper
atio
n.
Status
code
s are erased
after 72
hours
or
can be man
ua
lly
er
ased
b
y
putting
setu
p
s
w
itch
SW1-
1 in
the
ON
posi
tio
n
and jumper
ing R
,
W/W1
, and
Y
/Y
2
sim
ultaneou
sly
until status
code
#11
is
flashed.
NO
Is 24V presen
t at
W/W1
,
W2,
Y
1
,
Y
/Y
2
or
G ther
mosta
t
ter
mi
nals on
the
fur
na
ce
control? Discon
nect all the
ther
mostat
w
ires fro
m
the fur
n
ace
control.
YES
Does
the
prob
lem
repeat w
hen using
a
jumper w
ire?
Replace furnace
co
ntrol.
The thermostat is not
compa
tib
le
w
ith the
fur
na
ce
con
trol
.
Either install a ballast
resi
sto
r, conne
ct th
e
C
om24V
ther
mo
stat
ter
minal
to
the
ther
mosta
t, or replace
the
ther
m
o
stat.
YES
YES
Chec
k room
ther
mosta
t or
inter
conne
cting cab
le
.
Close door s
witch.
NO
NO
NO
YES
NO
NO
YE
S
Y
ES
NO NO
—15—