L.B. White Sentinel Radiant Tube AT150 40' Center Mount - Manual (Page 25)

Red LED Constant On
Normal Operation
Problem Red LED not on during a call for heat.
Is heat
er
plugged in?
Does heat
er
star
t?
Ye
s
No
Ye
s
Ye
s
Ye
s
Is
thermostat
set abo
v
e
r
oom
te
m
perature?
Set thermostat
abo
v
e
r
oom
te
m
perature.
Is
thermostat
def
ectiv
e? Check
for v
oltage supply
int
o and out of
thermostat.
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
o
r
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
e
r
cor
d f
or continuity
.
R
eplace thermostat
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
contr
ol t
erminal W
during ignition
seq
uence
P
oor electrical connection or br
ok
en wire present. R
epair or replace.
V
oltage dr
op fr
om thermostat t
o
t
erminal W on ignition contr
ol.
Incorrect wire size fr
om thermostat t
o
t
erminal W on ignition contr
ol.
Ye
s
R
eplace ignition contr
ol.
Is
pr
oper
v
oltage supplied
to
transf
ormer?
Check electrical connections and po
w
e
r
supply t
o
transf
ormer
.
R
epair as necessar
y.
No
Ye
s
24
Plug heat
er in.
No
Ye
s
R
eplace red LED
No