L.B. White 170 Tradesman Portable Forced Air - Manual (Page 20)

Two Times Indicates lack of air proving in fan section (
F
lash
pattern begins within 90 seconds after condition Occurs).
Do air pr
o
ving switch
contacts close?
Check continuity
.
R
emo
v
e
dir
t.
repair or replace f
an.
Is f
an binding,
or bent, or cak
ed with dir
t? No
Is f
an loose On
mo
tor shaf
t?
Tight
en f
an blade set scre
w
Is pr
oper v
oltage
supplied t
o
mo
to
r
fr
om ignition contr
ol?
R
eplace
mo
to
r
Does ignition
contr
ol send v
oltage
to
air pr
o
ving
switch?
Is
ignition contr
ol
receiving pr
oper
v
oltage?
No
Is
pr
oper v
oltage
supplied t
o
heat
er
po
w
er cor
d?
Def
ectiv
e
ignition contr
ol.
Def
ectiv
e air pr
o
ving
switch.
20
Is switch binding?
R
epair
.
TRADESMAN U
L
TRA HEATER
Problem
Does f
an mo
to
r
run?
No
Ye
s
Check cir
cuit break
er
s,
and an
y e
xt
ension
cor
ds if used. Contact a
q
ualif
ied electrician
No
Def
ectiv
e ignition
contr
ol
R
emo
v
e
block
age
Are there
block
ages at air
inlet of heat
er?
No
No No
No
No
No
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s