11
NO PREVIOUS CODE
–
Stored codes
are er
ased after 72 hours
. On RED LED
boards stored status codes can also be
er
ased whene
v
er po
w
er (115V or 24V)
is interr
upted.
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 the selected b
lo
w
er off-
dela
y,
if unit is po
w
ered up dur
ing a call
for heat (R-W/W1 closed) or when (R-
W/W1 opens) dur
ing the b
lo
w
er on-dela
y
per
iod.
1
3
LIMIT CIRCUIT LOCK
OUT
–
Loc
k
out
occurs if the limit or flame rollout s
witch
is open longer than 3 min
utes
. Control
will auto-reset after 3 hours
. See code 33.
Flame rollout s
witch requires man
ual reset.
14
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.
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
V
ING 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.
24
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.
31
HIGH-HEA
T PRESSURE SWITCH OR
RELA
Y DID NO
T CLOSE OR
REOPENED - Chec
k f
o
r:
-
Control rela
y ma
y be def
ectiv
e
.
-
Gas v
alv
e is mis
wired.
-
See status code 32.
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
o
r 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.
3
3
LIMIT CIRCUIT F
A
UL
T
–
Indicates the
limit or flame rollout s
witch is open.
Blo
w
er will r
un f
or 4 min
utes or until
open s
witch remak
es whiche
v
er is
longer
. If open longer than 3 min
utes
,
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 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
.
-
Def
ectiv
e b
lo
w
er motor or capacitor
.
-
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 the
component test mode to chec
k the igniter
.
First remo
ve
the R ther
mostat connection
from the control and initiate the
component test sequence
. 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
initiate another component test sequence
.
Chec
k f
or 115V betw
een pin 1 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
.
Fix
ed.
4
5
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.
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
.
-
Air leakage around igniter br
ac
k
et.
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
switch 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.
NO
YES
YES
YES
YES
NO
YES
YES
YES
NO
YES
NO
NO
NO
YES
NO
NO
Replace electrode
.
Is current near typical v
alue?
NO
Replace fur
nace control.
Will main b
u
rners ignite and sta
y on?
15
