Fan
Mo
to
r
Does
No
t
Run,
Heater
Does
No
t
Light.
Is heat
er
pr
operly connect
ed
to its building
wiring?
Det
ermine electrical
req
uirements of heat
er
. Ensure
it matches po
w
er supply
.
Check wiring of po
w
er supply
to heat
er
. Ensure correct
electrical polarity
. Check
gr
ounds t
o heat
er and
gr
ounded com
ponents in
heat
er
.
Ye
s
No
Ye
s
Ye
s
Does
the mo
tor rela
y
receiv
e po
w
er fr
om
the ignition
contr
ol?
Is there
continuity in
po
w
er supply wiring?
Check electrical connections and
continuity of wiring.
No
No
No
Do thermostat contacts close?
Check electrical connections and
continuity of thermostat.
Ye
s
R
eplace mo
tor
.
Ye
s
Ye
s
Are
air pr
oving
switch contacts
open?
R
eplace air pr
oving
switch .
No
Does the
mo
tor rela
y send
po
w
er t
o f
an
mo
tor?
R
eplace mo
tor
rela
y.
No
Is
air pr
oving
switch arm binding?
No
Ye
s
Check f
or debris ,
clean as needed.
Ha
ve
electrical
connections and
wires been check
ed
for continuity?
Check connections and wires, repair or replace if needed.
No
Ye
s
R
eplace ignition contr
ol
No
Is reset switch operational?
Check electrical connections and
continuity of reset switch.
If def
ectiv
e, replace
switch.
Ye
s
Problem
18
