L.B. White AD250(Spark Ignition) - Manual (Page 24)

Three Times Lac
k of
ignition. The module has gone int
o
saf
ety loc
kout.
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
valv
e?
Ha
ve
the burner
orif
ice, burner
casting and manif
old
been check
ed f
or
block
age?
Ye
s
Is pr
oper
burner manif
old
pressure read at
outlet of gas
valv
e?
Does ignit
er
spark?
Is flame
sensor clean?
Is ignit
er
pr
operly
connect
ed?
Is Ignit
er
Pr
operly Gapped?
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
otno
te
4 at end of
Tr
oubleshoo
ting section.
(A)
If lo
w or high pressure
is read, adjust outlet pressure as necessar
y.
(B)
If gas pressure is no
t
read, replace the gas contr
ol v
alv
e.
Def
ectiv
e ignit
er assembly
.
R
eplace ignit
er
.
Clean flame sensor with emer
y clo
th or
st
eel w
ool.
Connect ignit
er
to
ignit
er high
voltage cable.
Check gap betw
een ignit
er electr
ode and
burner casting. Gap should be 3/1
6 In.
R
epair or replace as necessar
y or replace
contr
ol module.
Pr
ovide pr
oper
pressure t
o heat
er
and check with a
gauge.
Check wiring betw
een
module and
com
ponent. R
epair
or replace as
necessar
y,
or replace
ignition contr
ol
module.
No
R
emo
ve
orif
ice and
burner casting. Blo
w
out with com
pressed
air or clean with a
sof
t brush.
No
No
No
No
No
No
No
No Is pr
oper
voltage supplied
to
flame
sensor?
Ye
s
Check wiring betw
een
module and com
ponent.
R
epair or replace as
necessar
y.
No
Is
flame sensor
insulat
or
crack
ed?
Ye
s
R
eplace sensor
.
No
Is
flame sensor
pr
operly
positioned?
Ye
s
Ye
s
Position flame sensor so 1/2 - 3/4 in. of tip is in burner flame.
No
Is heat
er
pr
operly
gr
ounded?
Contact electrician.
Syst
em must be
gr
ounded f
or
pr
oper operation.
No
23
Ye
s