22
TROUBLESHOOTING INFORMATION: UNITARY DIAGNOSTIC CODES
Dia
gnos
ti
c
/Sta
tu
s
LED Code
s
ComfortNet™
T
h
ermostat Onl
y
S
y
m
p
toms of
A
b
normal
Op
eratio
n
(L
eg
a
c
y
&
ComfortNet™ T
h
ermost
at)
G
ree
n
Y
e
llow
R
ed
R
ed Y
1
Fa
ult
De
s
c
ript
ion
Mess
ag
e
C
ode
Possible Cau
se
s
C
o
rrect
iv
e A
cti
on
s
Not
e
s
& Ca
utions
x
A
ir co
nd
iti
on
er/
h
e
a
t
pump
may
app
ea
r
to
be op
er
atin
g no
rmally
.
x
Int
egr
at
ed co
ntr
o
l modu
le
dia
g
n
o
st
ic/
s
ta
tu
s LE
D
’s
d
is
p
lay
the
in
dic
a
ted
co
de
.
OFF 9
Fla
s
he
s
OFF
ON if call
p
res
en
t;
OFF if no
call
x
Low
P
ilot
Vo
ltag
e
LO
W
SECO
ND
VOL
T
09
x
Contr
o
l
de
te
cts
s
e
co
nd
ar
y
v
o
lt
a
ge
le
ss
th
an
18
VAC.
x
Tr
a
n
sfor
me
r
ov
erloa
d
ed
.
x
Low
line
v
o
ltag
e.
x
Ch
e
c
k
fu
se
.
x
C
o
rre
ct
low
s
e
co
nd
ar
y
v
o
lt
a
ge
con
dit
io
n
.
x
C
h
ec
k
tr
a
n
sf
orm
e
r;
rep
la
c
e if ne
ed
ed.
x
Tu
rn
p
o
w
e
r
OFF
pri
o
r t
o
re
pai
r.
x
Fault
w
ill cle
ar if
s
e
co
nd
ar
y
v
o
lt
a
ge
ris
es ab
ov
e
21V
A
C
.
x
Re
p
lac
e w
it
h
co
rr
e
c
t
re
pl
ac
e
m
en
t p
a
rt
(s
).
x
Compre
s
s
o
r is
of
f.
x
Int
egr
at
ed co
ntr
o
l modu
le
dia
g
n
o
st
ic/
s
ta
tu
s LE
D
’s
d
is
p
lay
the
in
dic
a
ted
co
de
.
OFF
ON
ON
ON if call
p
res
en
t;
OFF if no
call
x
Co
mp
Pr
o
tec
to
r
O
pen
Not
dis
p
lay
ed
Not
dis
p
lay
e
d
x
N
o
cu
rr
ent
th
ro
ug
h r
u
n
or sta
rt
w
indi
n
g
s
.
x
Co
mp
re
ss
or
ru
n
w
inding is op
en
.
x
Compre
s
s
o
r
n
o
t
p
rop
er
ly
w
ir
e
d
t
o
con
tr
o
l.
x
F
aulty
comp
re
ss
o
r
wi
ri
n
g
.
x
F
a
ile
d c
o
mp
re
ss
o
r r
un
cap
ac
ito
r.
x
F
aulty
run
ca
pa
cit
o
r
wi
ri
n
g
.
x
Chec
k
c
o
mp
re
ss
o
r;
rep
a
ir
/r
epl
ac
e as
n
e
ed
ed
.
x
Ch
e
c
k
w
iring
;
rep
a
ir
/r
epl
ac
e as
n
e
ed
ed
.
x
Ch
e
c
k
ru
n
c
a
pa
ci
to
r;
r
e
p
lac
e
as ne
ed
ed.
x
Tu
rn
p
o
w
e
r
OFF
pri
o
r t
o
re
pai
r.
x
Fault
w
ill cle
a
r aft
e
r
1
no
rm
al
c
y
c
le
.
x
F
ault m
a
y
be
cle
a
re
d by
cy
cling
24V
A
C
to
co
ntr
o
l.
x
Re
p
lac
e w
it
h
co
rr
e
c
t
re
pl
ac
e
m
en
t p
a
rt
(s
).
