Pr
ob
le
m
11
2
M
ot
or
“h
um
s”
.
Are wires
disconnect
ed
betw
een mo
to
r
and capacit
or?
Ye
s
No
R
econnect wires. T
est f
or pr
oper operation.
Def
ectiv
e mo
tor or
capacit
or
. R
eplace.
Pr
ob
le
m
11
1
G
as
co
nt
ro
l
va
lv
e
“c
ha
tt
er
s”
.
Is
pr
oper v
oltage t
o
gas contr
ol v
alv
e
being supplied?
Ye
s
No
Ye
s
Has
pr
oper gas
pressure been
verif
ied?
Def
ectiv
e gas contr
ol v
alv
e solenoid. R
eplace entire v
alv
e.
Check f
or pr
oper v
oltage.
See heat
er nameplat
e.
Ha
ve
q
ualif
ied
electrician correct if
necessar
y.
Check f
or pr
oper inlet
and burner manif
old
pressure.
No
(1)
Some thermocouples use a retainer clip t
o secure the thermocouple int
o the pilo
t brack
et. Mak
e sure the thermocouple is pus
hed up com
plet
ely int
o the hole so clip
on thermocouple holds it securely within the brack
et. Other thermocouples use a retainer nut t
o hold the thermocouple in place
. Mak
e sure the nut is securely
tight
ened.
(2)
With an
y electrical pr
oblem, all wiring should be check
ed f
or good connections and pr
oper v
oltage and repaired if a pr
oblem
is f
ound.
(3)
The high-limit switch will open or “trip” f
or a v
ariety of reasons including high fuel pressure (see dataplat
e or o
wner’s ma
nual f
or pr
oper pressures) or reduced air flo
w
.
R
educed air flo
w is normally due t
o intak
e air obstructions, lo
w v
oltage or dir
ty f
an wheels, etc.
27
