21
Problem
LED Constant On
L
ED
L
ight
N
ot On
Normal Operation
Is
Select
or
Switch Set t
o
Heat?
Is F
an R
unning?
Set Select
or
Switch t
o
Heat
Ye
s
Ye
s
No
Ye
s
Ye
s
Ye
s
Is
Te
m
perature
Contr
ol Set A
b
o
v
e
R
oom
Te
m
perature?
Set Contr
ol
A
b
o
v
e R
oom
Te
m
perature.
Is
Te
m
perature
Contr
ol Def
ectiv
e?
Check f
or
Continuity
.
Is Pr
oper
V
oltage Supplied
to
Heat
er P
o
w
e
r
Cor
d and Thr
ough
P
o
w
er
Cor
d?
R
eplace T
e
m
perature Contr
ol.
Does Heat
er
Light?
Are
2
4
V
olts
Supplied fr
om
Transf
ormer?
No
No
No
No
No
Ye
s
Is
Pr
oper
V
oltage Supplied
to
T
ransf
ormer?
No
Ye
s
Ye
s
No
See “One Time Flash”
L.E.D. Light is Def
ectiv
e.
R
eplace Ignition Contr
ol.
Check Dataplat
e f
o
r
Electrical Supply
R
e
q
uirements. Pr
o
vide
Pr
oper V
oltage F
rom
Electrical Supply
. Check
Cir
cuit Break
er
s in Building
Electrical Syst
em. Check
P
o
w
er Cor
d f
or Continuity
.
R
eplace
Transf
ormer
No
Are
2
4
V
olts
Supplied t
o
Ignition Module?
P
oor Electrical Connection or Br
ok
en
Wire Present. R
epair or R
eplace.
R
eplace Ignition
Module.
Check Electrical
Connections and
P
o
w
er Supply t
o
Transf
ormer
.
R
epair as Necessar
y.
HEA
TING MODE
Ye
s
Summary of Contents for GreenGro Plus HD220
Page 2: ......
