A02108b
11
NO PREVIOUS CODE
–
Status codes
are er
ased after 72 hours or can be
man
ually er
ased b
y
putting setup s
witch
SW1-1 in the ON position and jumper
ing
R,
W/W1, and
Y/Y2 sim
ultaneously until
status code #11 is flashed.
Run system
through a lo
w-heat, high-heat, or cooling
cycle to chec
k system.
12
BLO
WER ON AFTER PO
WER UP
–
(115V OR 24V)
–
Nor
mal oper
ation.
Blo
w
er r
uns f
or 90 seconds
, if unit is
po
w
ered up dur
ing a call f
or heat (R-
W/W1 closed) or when (R-W/W1 opens)
dur
ing the b
lo
w
er on-dela
y per
iod.
13
LIMIT CIRCUIT LOCK
OUT
–
Loc
k
out
occurs if the limit, dr
aft saf
eguard, flame
rollout, or b
loc
k
ed v
ent s
witch* (if used)
is open longer than 3 min
utes or 10
successiv
e limit tr
ips occurred dur
ing
high-heat.
Control will auto-reset after 3
hours
. See code 33.
1
4
IGNITION LOCK
OUT
–
System f
ailed to
ignite gas and pro
v
e
flame in 4 attempts
.
Control will auto-reset after 3 hours
.
See status code 34.
1
5
BLO
WER MO
T
OR LOCK
OUT
–
Indicates
the b
lo
w
er f
ailed to reach 250 RPM or
the b
lo
w
er f
ailed to comm
unicate within
30 seconds after being tur
ned ON in tw
o
successiv
e heating cycles
. Control will
auto-reset after 3 hours
. See code 41.
21
GAS HEA
TING LOCK
OUT
–
T
u
rn
off
po
w
er and w
ait 5 min
utes to retr
y.
Chec
k f
o
r:
-
Stuc
k closed gas v
alv
e rela
y on control.
-
Mis
wire or shor
t to gas v
alv
e wire
.
2
2
ABNORMAL FLAME-PR
O
VING SIGNAL
Flame is pro
v
ed while gas v
alv
e is de-
energiz
ed.
Inducer will r
un until f
ault is
cleared.
Chec
k f
o
r:
-
Stuc
k open or leaky gas v
alv
e
.
23
PRESSURE SWITCH DID NO
T OPEN
Chec
k f
o
r:
-
Obstr
ucted pressure tube
.
-
Pressure s
witch stuc
k closed.
2
4
SECOND
AR
Y
V
O
LT
A
GE FUSE IS OPEN
Chec
k f
o
r:
-
Shor
t circuit in secondar
y v
oltage
(24V) wir
ing including ther
mostat
leads
. Disconnect ther
mostat leads
to isolate shor
t circuit.
32
LO
W
-HEA
T PRESSURE SWITCH DID
NO
T CLOSE OR REOPENED
–
If open
longer than 5 min
utes
, inducer shuts off
for 15 min
utes bef
ore retr
y.
If opens
dur
ing b
lo
w
er on-dela
y per
iod, b
lo
w
er will
come on f
or the selected b
lo
w
er off-dela
y.
Chec
k f
o
r:
-
Proper v
ent sizing.
-
L
o
w
inducer v
oltage (115V).
-
L
o
w
inlet gas pressure (if LGPS used).
-
Inadequate comb
ustion air supply
.
-
Disconnected or obstr
ucted pressure
tubing.
-
Def
ectiv
e inducer motor
.
-
Def
ectiv
e pressure s
witch.
-
Excessiv
e wind.
-
Restr
icted v
ent.
33
LIMIT CIRCUIT F
A
UL
T
–
Indicates the
limit, dr
aft saf
eguard, flame rollout, or
b
loc
k
ed v
ent s
witch* (if used) is open or
the fur
nace is oper
ating in high-heat only
mode due to 2 successiv
e lo
w-heat limit
tr
ips
. Blo
w
er will r
un f
or 4 min.
or until
open s
witch remak
es whiche
ver is longer
.
If open longer than 3 min., code changes
to loc
k
out #13.
If open less than 3 min.
status code #33 contin
ues to flash until
b
lo
w
er shuts off
. Flame rollout s
witch and
BVSS requires man
ual reset.
Chec
k f
o
r:
-
Dir
ty filter or restr
icted duct system.
-
Loose b
lo
w
er wheel.
-
Def
ectiv
e s
witch or connections
.
-
Inadequate comb
ustion air supply
(flame rollout s
witch open).
-
Restr
icted v
ent.
-
Proper v
ent sizing.
-
Excessiv
e wind.
3
4
IGNITION PR
O
VING F
AILURE
–
If flame
is not sensed dur
ing the tr
ial f
or ignition
per
iod, the control will repeat the ignition
sequence 3 more times bef
ore loc
k
out
#14 occurs
. If flame signal is lost dur
ing
the b
lo
w
er on-dela
y per
iod, b
lo
w
er will
come on f
or the selected b
lo
w
er off-dela
y.
Chec
k the f
ollo
wing items first bef
ore
proceeding to the ne
xt step
.
-
Gas v
alv
e tur
ned off
.
-
Man
ual shut-off v
alv
e
.
-
Green/Y
ello
w wire MUST be connected
to fur
nace sheet metal.
-
Flame sensor m
ust not be g
rounded.
T
o
deter
mine whether the prob
lem is in
the gas v
alv
e
, igniter
, or flame sensor the
system can be oper
ated in component
test mode
.
T
o
chec
k the igniter remo
v
e
the R ther
mostat connection from the
control, reset po
w
e
r,
and put setup s
witch
SW1-6 in the ON position to star
t the
component test.
Does the igniter glo
w
or
ange/white b
y
the end of the 15 second
w
a
rm-up per
iod?
4
3
LO
W
-HEA
T PRESSURE SWITCH OPEN
WHILE HIGH-HEA
T PRESSURE
SWITCH IS CLOSED - Chec
k f
o
r:
-
L
o
w-heat pressure s
witch stuc
k open.
-
Disconnected or obstr
ucted pressure
tube
.
-
Mis
wired pressure s
witches
.
-
L
o
w
inlet gas pressure (if LGPS used).
Unplug igniter har
ness from control and
repeat component test b
y
tur
ning setup s
witch
SW1-6 OFF and then bac
k ON.
Chec
k f
o
r
115V betw
een pin 3 and NEUTRAL-L2 on
the control.
W
as 115V present f
or the 15
second per
iod?
Reconnect the R ther
mostat lead and set
ther
mostat to call f
or heat.
Connect v
oltmeter
across gas v
alv
e connections
. Does gas
v
alv
e receiv
e 24V?
Does gas v
alv
e open and allo
w gas to flo
w?
Do the main b
u
rners ignite?
Do the main b
u
rners sta
y on?
Repeat call f
or heat and chec
k flame sensor
current dur
ing tr
ial f
or ignition per
iod.
Is the
DC microamps belo
w 0.5?
Clean flame sensor with fine steel w
ool and
rechec
k current.
Nominal current is 4.0 to
6.0 microamps
.
Is current near typical v
alue?
Will main b
u
rners ignite and sta
y on?
Fix
ed.
45
CONTR
OL CIRCUITR
Y LOCK
OUT
A
uto-reset after 1 hour loc
k
out due to:
-
Flame circuit f
ailure
.
-
Gas v
alv
e rela
y stuc
k open.
-
Softw
are chec
k error
.
Reset po
w
er to clear loc
k
out.
Replace control if code repeats
.
Replace fur
nace control.
Chec
k f
or contin
uity in the har
ness and
igniter
. Replace def
ectiv
e component.
YES
NO
YES
YES
YES
NO
YES
Chec
k connections
. If OK, replace control.
Chec
k that all gas v
alv
es are tur
ned on.
Replace v
alv
e
.
Chec
k f
o
r:
-
Inadequate flame carr
y
o
v
er or rough
ignition.
-
L
o
w
inlet gas pressure
.
-
Proper fir
ing r
ate
.
-
Bloc
k
ed or incorrect carr
y- o
v
er gap
.
(.045
” nominal)
Allo
w b
lo
w
er to come on and repeat test
to chec
k f
or inter
mittent oper
ation.
Chec
k connections and retr
y.
If current is
near typical v
alue (4.0-6.0 nominal) and
b
u
rners will not sta
y on, repeat chec
k in high-
heat.
If b
u
rners will still not sta
y on replace
control.
If b
u
rners oper
ate in high-heat then
s
witch to lo
w-heat,chec
k manif
old pressure
.
If OK, chec
k b
u
rner carr
y
o
v
er and flame
sensor location.
Replace electrode
.
Replace fur
nace control.
NO
NO
NO
YES
NO
NO
NO
NO
YES
* Bloc
k
ed v
ent s
witch used in Chimne
y Adapter Kit
YES
YES
48
