L.B. White 400 Tradesman Portable Forced Air - Manual (Page 22)

Three Times I
ndicates ignition
failure.The ignition control is in safety lockout..
Is pr
oper fuel
supplied t
o
heat
er
inlet?
Connect pr
oper
gas supply t
o
heat
er
. Open all
gas shut
of
f v
alv
es.
Is pr
oper gas
pressure supplied
to
heat
er?
Pr
o
vide pr
oper gas
supply pressure t
o
heat
er
. R
e
fer t
o
dataplat
e. If LP gas is
used, ensure LP container is full.
Is backflash
switch tripped?
Check
continuity
If switch is tripped,
det
ermine cause.
Check f
or obstruction at
discharge outlet of heat
er
,
and lo
w v
oltage fr
om po
w
e
r
supply
, orn im
pr
oper
o
v
er
sized burner orif
ice.
Is Ignit
or
pr
operly
gapped?
Is pr
oper
v
oltage
supplied t
o
gas v
alv
e?
Def
ectiv
e gas
v
alv
e.
Check ignit
er gap
R
egap t
o
.
1
0 in.
Def
ectiv
e wires or
connections. If good,
replace ignition contr
ol.
Does ignit
or
spark?
Is ignit
er high v
oltage
lead securely
connect
ed?
R
eposition
Ignit
er
.
(See Ser
vice
Instructions)
Connect high v
oltage lead
21
Five Times
If contr
ol module does no
t reset, then replace the it (Int
ernal
boar
d f
ault.)
If module resets, then ha
v
e
q
ualif
ied electrician check po
w
e
r
sour
ce f
or po
w
er q
uality pr
oblems. (F
req
uency
, line noise, line
spik
es, loose connections, t
oo small wire gauge.)
Flame sense relat
ed pr
oblems. Check f
o
r
crack
ed or dir
ty flame sensor
, im
pr
operly
positioned sensor
, or poor flame sense gr
ound.
Four Times Rapid On/Off cycling of the burner.
Does gas
solenoid v
alv
e open?
Problem
Is the heat
er
pr
operly
gr
ounded?
No
Ensure all
Gr
ounds are
Connect
ed.
Det
ermine if ignit
or receiv
es high v
oltage:
-- Disconnect ignition lead fr
om ignition contr
ol.
-- P
osition a scre
wdriv
er tip about 3/1
6 inch a
w
a
y
fr
om ignition contr
ol where lead w
as connect
ed .
-- WITH GAS OFF
, star
t the heat
er
.
-- If no spark is seen, replace the igntion contr
ol.
-- If spark is seen, reconnect igntion lead t
o
contr
ol.
-- Disconnect the lead at the ignit
or
.
-- Hold the lead about 3/1
6 in. fr
om a gr
ounded
section of the heat
er
.
-- WITH GAS OFF
, star
t the heat
er
.
-- If no spark is obser
v
ed, replace the ignition lead.
-- If spark is obser
v
ed, replace the ignit
or
.
Is ignit
or gap
positioned
to
w
a
rd
burner
orif
ice?
No
No
No
No
No No
No
No
No
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s