I-40 Manual and Spark Ignition
Owner’s Manual • I-40
29
P
ro
b
le
m 4
O
ut
er c
om
bu
st
io
n
co
ne
d
oe
s n
ot h
ea
t
up
o
n h
ig
h t
he
rm
os
ta
t
se
tting
.
A
re
there
blockages
in
gas
hose
, piping
,
ai
r h
ou
si
ng o
r v
en
tu
ri
tube
?
Is
p
ro
pe
r g
as p
re
ss
ur
e
be
in
g s
up
pl
ie
d t
o t
he
hea
ter
?
Is
s
ec
on
da
ry o
ri
fi
ce
plugged
?
A
. R
emo
ve
ther
mo
-
st
at
ic
h
ea
d f
ro
m
mod
ula
ting
v
alv
e.
If o
ut
er c
on
e l
ig
ht
s,
re
pl
ac
e t
he
rm
os
ta
tic
he
ad
a
nd s
en
so
r
as
semb
ly
.
OR
B.
R
ep
la
ce
mod
ula
ting
va
lv
e.
C
he
ck f
or p
ro
pe
r g
as
pr
es
su
re
to
h
ea
te
r.
Pr
es
su
re
m
us
t b
e 5 P
SI
G
.
Rem
ove
o
ri
fi
c
e
an
d
cl
ea
n i
t.
R
em
ov
e t
he c
om
po
ne
nt
an
d c
le
an i
t.
Ye
s
No
No
No
Ye
s
Ye
s
