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22
Pr
ob
le
m
33
M
ot
or
r
un
s.
B
ur
ne
r
do
es
n
ot
lig
ht
w
ith
pi
lo
t
lig
ht
lit
.
Is
pr
oper v
oltage being
deliv
ered t
o the
air pr
oving switch?
Ye
s
No
Ye
s
Ye
s
Ye
s
Ye
s
Are air pr
oving
switch contacts opening
and closing pr
operly?
(P
er
form a continuity
check
.)
Are
air pr
oving
com
ponents
binding?
R
epair or replace as necessar
y.
Check v
oltage supply
to
transf
ormer and fuse.
Check electrical connections t
o switch. Check wires f
or
continuity
.
R
epair as necessar
y.
R
eplace air flo
w switch
or f
or units with
centrifugal switch,
replace mo
to
r.
Is
flapper arm (if applicable)
engaging switch
arm pr
operly?
Adjust flapper arm t
o engage
switch arm or clean out an
y
debris fr
om ar
ound flapper
or air flo
w switch.
Tight
en set scre
ws
to
mo
tor shaf
t.
R
eset switch.
Det
ermine cause of
high limit tripping. (See Pr
oblem 7
.)
Ye
s
Clean out debris.
Check electrical connections
to
high limit switch and t
o contr
ol
valv
e and check wires f
or continuity
.
Check f
or pr
oper pressure
using lo
w pressure gas gauge.
R
ef
er t
o heat
er nameplat
e.
Ye
s
Ye
s
Ha
ve
you check
ed
for pr
oper inlet and
burner manif
old
pressure at gas contr
ol
valv
e?
If pr
oper gas pressure is supplied t
o
the inlet of the gas contr
ol v
alv
e, but
burner manif
old pressure is no
t
apparent, then replace the contr
ol
valv
e.
Is high limit
switch tripped?
No
No
No
Are
burner
orif
ice, burner
casting or manif
old
plugged?
No
No
No
Ye
s
Is fa
n
tight
ened pr
operly
to
mo
tor
shaf
t?
No
Is pr
oper v
oltage
supplied t
o and
fr
om high limit
switch t
o contr
ol
valv
e?
No