Pr
ob
lem 2
Pilot will
not sta
y lit
when pilot
contr
ol
b
utton is
released.
Is LP
gas supply
cylinder tank
full?
Ye
s
No
Ye
s
Ye
s
Ye
s
Ye
s
Did
y
ou allo
w
sufficient time to
allo
w ther
mocouple
w
a
rm
up?
Is
ther
mocouple
contact n
ut
tight?
Is
ther
mocouple
proper
ly positioned
in pilot
br
ac
k
et?
Fill container if lo
w
.
Allo
w 30 - 60 seconds
w
a
rm
up bef
ore releasing
pilot b
u
tton.
Sn
ug n
ut in place
.
(Do
not o
v
er
tighten.)
Pilot flame should
impinge on 3/8 - 1/2 in.
of ther
mocouple tip
.
Disassemb
le and
clean with
compressed air
.
D
o
not use pointed
instr
uments
.
Replace
pilot or
ifice if
Is
pilot assemb
ly
,
including or
ifice
,
clean?
Are
pilot line
or gas supply
hose par
tially
plugged?
Ye
s
Remo
v
e
and clean
with compressed air
.
No
No
No
Chec
k f
or proper
pressure to heater
inlet.
Ref
er to
heater nameplate
.
Replace with proper
pilot or
ifice
.
No
No
Chec
k milliv
olt output.
10
MV or g
reater is acceptab
le
.
Replace ther
mocouple if
less than 10 MV (with
b
u
rner off).
No
Ye
s
Did y
ou
chec
k f
or dir
t or
debr
is betw
een
ther
mocouple contact
and electromagnet
of v
alv
e?
Chec
k f
or debr
is
betw
een contact of
ther
mocouple and
electromagnet of v
alv
e
.
No
Ye
s
Is proper pilot
or
ifice installed?
Ye
s
Has
ther
mocouple
strength been
chec
k
ed with
tester?
Ye
s
Has drop
out of saf
ety magnet
on pilot control been
chec
k
ed?
Is
proper gas
pressure supplied
to heater?
No
No
Chec
k milliv
olt dropout.
4 MV or less
is proper
.
O
v
er 4 MV is w
eak v
alv
e
.
Replace entire v
alv
e
.
No
August 1999
5.1-4
4
Summary of Contents for AS040
Page 9: ......
