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5.1-6
6
August 1999
Th
re
e T
Ti
m
es
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?
H
av
e
the burner
orif
ice, burner
casting and manif
old
been check
ed f
or
block
age?
Ye
s
Ye
s
Is pr
oper
burner manif
old
pressure read at
outlet of gas
valv
e?
Does ignit
er
glo
w?
Is flame
sensor clean?
Is ignit
er
pr
operly
connect
ed?
Are
120 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
otno
te
4 on page 5.
1-7
.
(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
.
Pe
rf
orm continuity
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
er
supply wiring.
Check wiring betw
een module and
com
ponent. 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