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5.1-5
5
August 1999
Tw
o T
Ti
m
es
Flash patt
ern
begins 12 seconds af
te
r
condition occur
s.
(Patt
ern
indicat
es
lac
k of air
pr
oving in fan
section of unit.)
Are air
-pr
oving switch
contacts stuck open? (P
er
form
continuity check
.)
Does
fan mo
tor star
t up
for prepurge
during initial call
for heat?
Is f
an wheel binding?
Is f
an wheel
loose on mo
to
r
shaf
t?
Ye
s
Ye
s
Ye
s
No
Check f
or binding of
air
-pr
oving switch arm
on housing, air
-pr
oving
flapper stuck, or out of adjustment. R
epair or
replace as necessar
y.
Ye
s
Ye
s
Check f
or pr
oper clearance of f
an
wheel t
o mo
tor mount. If good,
replace f
an wheel, or check f
or
housing alignment.
Tight
en set scre
w(s) on f
an. Mak
e
sure set scre
w(s) are tight
ened
against flat(s) of mo
tor shaf
t.
Ye
s
Clean the f
an wheel with
com
pressed air or sof
t brush.
Def
ectiv
e
mo
tor or
capacit
or
.
R
eplace
mo
to
r.
Ye
s
R
emo
ve
obstruction.
Clean as necessar
y.
No
Is f
an wheel
plugged with
dir
t?
No
Is
there an
obstruction
in blo
w
er outlet
pre
venting air
-
pr
oving switch closure?
No
Is
pr
oper v
oltage
supplied t
o mo
to
r
fr
om ignition module?
No
If im
pr
oper v
oltage is supplied,
contact electrician.
- OR -
If no v
oltage is supplied t
o mo
to
r,
check wiring, replace mo
tor rela
y
(if applicable), or replace ignition
contr
ol module.
No
Ye
s
Is
pr
oper
voltage being
sent t
o air
-pr
oving
switch?
Check wiring betw
een module and
com
ponent. R
epair or replace as
necessar
y,
or replace ignition
contr
ol module.
No