L.B. White AD250 - Manual (Page 21)

Problem LED light no
t on
during a call f
o
r
heat.
Is heat
er
plugged in?
Plug heat
er in.
Ye
s
No
Ye
s
Ye
s
Is
building contr
oller
calling f
or heat?
Set contr
oller t
o
call f
or heat.
Is
pr
oper
v
oltage supplied
to
heat
er po
w
er cor
d
and thr
ough po
w
er
cor
d?
Check dataplat
e f
or electrical
supply req
uirements. Pr
o
vide
pr
oper v
oltage fr
om electrical
supply
. Check cir
cuit break
er
s
in building electrical syst
em.
Check po
w
er cor
d f
o
r
continuity
.
Are 2
4
v
olts
supplied fr
om
transf
ormer?
R
eplace
transf
ormer
No
No
No
No
Ye
s
Are
2
4
v
olts
supplied t
o
ignition
module?
P
oor electrical connection or br
ok
en
wire present. R
epair or replace.
Ye
s
LED light in contr
ol module is
def
ectiv
e. R
eplace ignition
module.
Is
pr
oper
v
oltage supplied
to
transf
ormer?
Check electrical connections and po
w
er supply t
o
transf
ormer
.
R
epair as necessar
y.
No
Ye
s
21
Heat
er does no
t
cy
cle abo
v
e
minimum heat output.
Is t
e
m
perature
setting aligned
betw
een building
contr
ol and
Smar
tBo
x
™
No
Is pr
oper gas
pressure supplied
to
heat
er?
Ye
s
Pr
o
vide pr
oper
pressure t
o
heat
er and
check with a gauge.
No
Ensure t
e
m
perature
settings are aligned
betw
een the building
contr
oller and the
Smar
t o
x
™ . R
eset if
needed.
Is v
ariable rat
e
solenoid on gas
contr
ol v
alv
e
receiving DC v
olts
fr
o
m
Smar
tBo
x
™?
No
Ye
s
Problem
Measure acr
oss t
erminals of
modulating gas contr
ol v
alv
e f
o
r
an
ywhere fr
om 1-1
5 v
olts DC.
If absent, check all wiring. If wiring is
good, the
Smar
t Bo
x
™
must be
inspect
ed f
or pr
oper operation.
Def
ectiv
e v
ariable rat
e gas contr
ol
solenoid v
alv
e. R
eplace gas
contr
ol.
Ye
s