L.B. White AD250 - Manual (Page 22)

Problem LED Flashing One Time Flash patt
ern begins
immediat
ely
, fan mo
to
r
does no
t run. Heat
er
does no
t light.
Is air
-pr
o
ving switch
arm or paddle binding
on housing? Is there
an obstruction in
heat
er outlet? Is air
-
pr
o
ving switch
shor
ted? (P
er
form
continuity check on air
-
pr
o
ving switch.)
Ye
s
No
Ye
s
R
eplace air
-pr
o
ving switch.
Long Flash Tw
o seconds
on, tw
o seconds
of
f repe
titiv
ely
for 1
5
minut
es.
Heat
er has att
em
pt
ed three ignition trials. Heat
er is in a 1
5
minut
e w
ait period bef
ore att
em
pting three
more trials f
or ignition. If ignition is no
t achie
v
ed af
ter the seciond set of ignition trials, the heat
er will
lock out and the ignition contr
ol module’s LED will giv
e a three time flash patt
ern. disconnect the
heat
er fr
om its electrical supply
, and reconnect it t
o
restar
t the heat
er and identify cause of f
ailure.
22
R
epair and/or remo
v
e
obstructions. check f
o
r
damaged f
an housing. Clean or repair as
needed.