21
NOTES
:
(1)
With an
y electrical pr
oblem, all wiring should be check
ed f
or good connections and pr
oper v
oltage.
(2)
The ignition contr
ol module sends and receiv
es v
oltages thr
oughout the entire operation seq
uence.
The ignition contr
ol module t
erminals should also be check
ed f
or deliv
ering pr
oper v
oltages in
addition t
o the individual com
ponents t
o mak
e sure the boar
d itself is w
orking pr
operly
.
(3)
The high limit switch will activ
at
e f
or a number of reasons. Common pr
oblems associat
ed with this
are high gas pressure, lo
w v
oltage, loose or dir
ty f
ans, restrictions/block
ages at air inlets or
outlets, or e
xcessiv
e dust and dir
t accumulations in the heat
er
.
Heater
Lights,
But
Doesn’t
Stay
Lit.
Is
ignition contr
ol
sending po
w
er t
o the
flame sensor f
or
flame pr
oving?
No
Ye
s
Verify contr
ol is sending
165 - 1
80 v
olts A
C t
o sensor
.
If no
t replace contr
ol module.
Fill LP gas tank
.
Is LP gas tank full?
Ha
ve
inlet and
burner manif
old gas
pressures been
check
ed?
No
Ye
s
Check the gas pressures.
Ye
s
Is
flame sensor
dir
ty?
No
Ye
s
Clean the sensor with emer
y
clo
th or st
eel
w
ool.
Is
flame sensor
touching metal?
No
Ye
s
R
eposition
sensor a
w
ay
fr
om metal.
Check sensor lead f
or
nicks and cuts. R
eplace
ignit
er/sensor assembly
if def
ects are f
ound.
Is
flame sensor
insulat
or
crack
ed?
No
Ye
s
R
eplace
ignit
or/sensor
assembly
Ensure heat
er is
pr
operly connect
ed.
Check f
or pr
oper
electrical polarity and
good gr
ounds.
Is
heat
er
pr
operly connect
ed
to its electrical
supply?
Ye
s
Problem
