Is
There a
Block
age in the
Inject
or Body or
Venturi T
ube?
21
Pr
ob
le
m
11
In
ne
r
C
om
bu
st
io
n
C
on
e W
W
ill
N
ot
LL
ig
ht
Is
Thermostatic Head Set t
o
Maximum?
Is the
Primar
y Orif
ice
Plugged on the
Inside or Outside?
Turn Thermostat
Up t
o Its
Maximum Setpoint.
R
emo
ve
the Primar
y Burner
Orif
ice. Clean with a Sof
t
Brush or Com
pressed air
.
Ye
s
No
Ye
s
Ye
s
Ye
s
Is the Inner
Combustion Cone
Plugged?
Is There Air or
a Block
age in the
Gas Hose or Gas Piping?
R
emo
ve
Block
age with Com
pressed
Air or R
eplace the Gas Hose or Pipe
Section. Bleed Of
f an
y Air fr
om the
Gas Line.
Clean the Heat
er
.
Clean the Heat
er
.
No
No
No
Is Pr
oper
Gas Pressure Supplied t
o the
Zone Panel or
Heat
er?
Pr
ovide 5 PSIG
Gas Pressure.
Ye
s
No
Are all F
uel
Supply V
alv
es t
o
Heat
er Open?
Open All F
uel
Supply V
alv
es.
Ye
s
No
Def
ectiv
e
Saf
ety Contr
ol V
alv
e.
R
eplace the Saf
ety
Contr
ol V
alv
e.
Ye
s
No