A02204b
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
heating 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
closed) or when (R-W opens) dur
ing the
b
lo
w
er on-dela
y per
iod.
1
3
LIMIT CIRCUIT LOCK
OUT – Loc
kout
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.
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.
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.
3
1
PRESSURE SWITCH DID NO
T CLOSE
OR REOPENED – If open longer than 5
min
utes
, inducer shuts off f
or 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 or flame rollout s
witch is open.
Blo
w
e
r
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.
- Blo
w
er motor on incorrect speed tap
.
- Input r
ate to fur
nace set too high.
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?
Unplug igniter har
ness from control and initiate
another component test sequence
. Chec
k
for 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?
Is current near typical v
alue?
Will main b
u
rners ignite and sta
y on?
Fix
ed.
Clean flame sensor with fine steel w
ool and
rechec
k current.
Nominal current is 4.0 to 6.0
microamps
.
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.
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
.
-
Chec
k f
or air leakage around igniter br
ac
ket.
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, replace control.
Replace electrode
.
Replace fur
nace control.
YES
YES
YES
YES
NO
YES
YES
YES
NO
YES
NO
NO
NO
YES
NO
NO
NO
NO
—15—
