L.B. White AW250(building controller) User Manual
Page 24

24
Three Times
Ignition failure.
The module has
gone into safety
lockout.
Is
LP tank
full and pr
operly
sized and are all gas
supply v
alv
es t
o
heat
er open?
Fill tank or resize if
necessar
y.
Open all
gas Supply v
alv
es
Ye
s
No
Is pr
oper gas
pressure supplied
to
heat
er?
Ye
s
Are 2
4
v
olts
supplied t
o
the
gas contr
ol
V
alv
e?
H
av
e
the burner
orif
ice, burner
casting and manif
old
been check
ed f
o
r
block
age?
Ye
s
Ye
s
Is pr
oper
burner manif
old
pressure read at
outlet of gas
v
alv
e?
Does ignit
er
glo
w?
Is flame sensor
clean?
Is ignit
er
pr
operly
connect
ed?
Are
1
1
5 v
olts
supplied fr
om
ignition contr
ol
module t
o
ignit
er?
Ye
s
Ye
s
Are high limit
switch contacts
closed?
Ye
s
Ye
s
Ye
s
If contacts are open,
reset the switch.
Det
ermine cause of
high limit tripping. See
fo
o
tno
te
at the end of
the tr
oubleshoo
ting
section.
(A)
If lo
w pressure is
read, adjust outlet
pressure as
necessar
y.
(B)
If gas pressure is no
t
read, replace the
contr
ol v
alv
e.
Def
ectiv
e ignit
er
.
P
e
rf
orm ohm check
and replace ignit
er If
necessar
y.
Clean flame sensor
with emer
y clo
th or
st
eel w
ool.
Connect ignit
er
to
ignit
er po
w
e
r
supply wiring.
Check wiring betw
een contr
ol module
and ignit
er
. R
epair or replace as
necessar
y.
If wiring is good, replace
ignition contr
ol module.
Pr
o
vide pr
oper
pressure t
o
heat
er and
check with a gauge.
(A)
Check f
or def
ectiv
e wires
or connections. R
epair
or replace.
(B)
Check f
or v
oltage t
o
limit
switch. If v
oltage is no
t
deliv
ered t
o
switch,
replace ignition contr
ol
(C)
Check f
or v
oltage fr
om
limit t
o
gas v
alv
e. if
v
oltage is no
t sent t
o
v
alv
e, replace high limit
switch.
No
R
emo
v
e
com
ponents
and blo
w out with
com
pressed air or
clean with a sof
t
brush.
No
No
No
No
No
No
No
No
Is wiring betw
een
flame sensor and
ignition contr
ol in
good condition?
Ye
s
Check wiring, repair or
replace as needed.
No
Is
flame sensor
insulat
or
crack
ed?
Ye
s
R
eplace sensor
.
No
Ensure pr
oper
position of lame
sensor
. (1/2 t
o
3/4 of tip in
burner flame)
Ye
s
Is heat
er
pr
operly
gr
ounded?
Contact electrician.
syst
em must be
gr
ounded f
o
r
pr
oper operation.
No
Ye
s