21
Pr
ob
le
m
22
Pi
lo
t LL
ig
ht
s,
bu
t ww
ill
nn
ot
S
ta
y L
Li
t
Did y
ou
Allo
w Suf
ficient Time
for the Thermocouple
to
W
arm Up?
Are
the Gas Hose, Bypass tube, or
Pilo
t Line Par
tially
Plugged?
Allo
w 30 - 60
Seconds W
arm-Up
Bef
ore R
eleasing
Pilo
t Butt
on.
R
emo
ve
the Com
ponents and
Clean with Com
pressed Air
.
Ye
s
No
Ye
s
Ye
s
Ye
s
Is
Thermocouple
W
eak or
Def
ectiv
e?
A.
Check Thermofuse in Thermocouple for Continuity
. If Thermofuse is
“Open”, R
eplace Thermocouple.
B.
If Thermofuse is Good, Check Milliv
olt Output of Thermocouple
with Milliv
olt T
est Kit. Output Should
be at Least 4 m
v D.C. A R
eading of
Less than 4 m
v D.C. can Cause Pilo
t
Flame or Inner Cone Dr
op-Out. If
Thermocouple is W
eak, R
eplace it.
Is Pilo
t
Saf
ety Contr
ol
Valv
e W
eak or
Def
ectiv
e?
Is Pilo
t Orif
ice
Plugged?
Check Gas Pressure t
o the
Heat
er Inlet with a Gas
Gauge. Pr
oper Pressure at
High Fire - 5 PSIG.
Pilo
t Pressure - 20 in. W
.C.
No
No
No
Is Thermo-
couple Contact N
ut
Tight
ened Securely int
o
Gas Contr
ol
Valv
e?
Snug Contact N
ut in
Place. (Do No
t
Ov
er
tight
en.) Check f
or
Debris Betw
een Contact
of Thermocouple and Electr
omagnet of V
alv
e.
Ye
s
No
Is
Thermocouple Tip Positioned Pr
operly
int
o Flame?
Position Edge of
Thermocouple t
o be
1/2 - 9/1
6 in. abo
ve
Br
ooder Housing.
Ye
s
No
Is Butt
on
on Pilo
t Saf
ety V
alv
e
Fully Depressed?
Depress the Butt
on on the
Pilo
t Saf
ety V
alv
e until Gas
Flo
ws Thr
ough.
Ye
s
No
Check Dr
op-Out of Electr
omagnet in Pilo
t
Valv
e with the Milliv
olt T
est Kit. The V
alv
e
Magnet Should Dr
op Out at 2.0 m
v D.C. If
the Magnet Dr
ops Out abo
ve
2.0 m
v D.C.,
R
eplace the Pilo
t V
alv
e.
Ye
s
Is Pr
oper Gas
Pressure Supplied t
o
the Heat
er?
No
Clean the Pilo
t Orif
ice b
y either:
A.
Utilizing the Pilo
t Clean-Out De
vice
OR
B. Use a Sof
t Brush or Com
pressed
Air
. If Orif
ice canno
t be Cleaned,
R
eplaced it.
Summary of Contents for I17
Page 2: ......
