24
TROUBLESHOOTING
Comfor
tNet™
Ther
mostat Onl
y
S
y
m
p
toms of
A
b
normal Ope
ration
(Legac
y
& Comfor
tNet™ Thermostat)
7-Segment LED
Codes
Characters
Wi
ll
A
lter
nate
Faul
t Desc
ri
pti
on
Messa
ge Code
Possible
Causes
Correct
iv
e
A
c
tions
Notes & Cautions
x
Air hand
ler
blow
er fails to
opera
te
x
Inte
grated con
trol
module
LED
displa
y
prov
ides no
sign
al.
x
ComfortNe
t™
ther
mosta
t “Call for
Serv
ice” icon il
lumi
nated
x
ComfortNe
t™
ther
mosta
t
scroll
s
“Check Air
Handle
r”
message
No Dis
play
x
No 208/230 v
o
lt
po
w
e
r
to ai
r ha
ndler
blow
er
or no
24
v
o
lt pow
er to
integra
ted
co
ntro
l
module
x
Blow
n fuse
or
circu
it
breaker
x
Inte
grated
con
trol
module ha
s
an in
te
rnal
fault.
IN
TERNAL
FAULT
EE
x
Manual
di
sconne
ct sw
itch OFF
or 24
v
o
lt w
ire impr
operly
conne
cted or
loo
se
x
Blow
n fuse
or
circu
it
br
eake
r
x
Inte
grated con
trol
module
ha
s
an in
ternal
fa
ult
x
Assure
208/230 v
o
lt an
d 24
v
o
lt pow
er to ai
r ha
ndler
blow
er and in
tegra
ted contr
ol
module.
x
Check in
tegra
ted
control
module
fuse
(3A
).
Replace
if
nece
ssa
ry
.
x
Chec
k for poss
ible
s
hort
s in
208/230
v
o
lt and
2
4
v
o
lt
cir
cuits.
Repair
as
nece
ssa
ry
.
x
Replace
bad
inte
gr
ated
control mod
ule.
x
Turn pow
er OFF pri
or to
repair.
x
Replace
inte
grated
cont
rol m
o
d
u
le
fu
se
w
ith
3A au
tom
otiv
e f
u
se
.
x
Replace
inte
grated
control mod
u
le w
ith
corre
ct rep
lacemen
t pa
rt
x
Read pre
cau
tion
s i
n
“Electro
sta
ti
c Di
sch
arge”
section
o
f manu
al.
x
Air hand
ler
blow
er fails to
opera
te
.
x
Inte
grated con
trol
module
LED
displa
y
prov
ides
indi
cated error code
.
x
ComfortNe
t™
ther
mosta
t “Call for
Serv
ice” icon il
lumi
nated
.
x
ComfortNe
t™
ther
mosta
t
scroll
s
“Check Air
Handle
r”
message
.
d0
x
D
a
ta no
t y
e
t on
netw
ork.
NO NET
DATA
d0
x
Air hand
ler
blow
er does not
contain any
shared
data
.
x
Populate
shared
da
ta se
t
using
memory
card
.
x
Turn pow
er OFF pri
or to
repair
x
Use memory
card
for
the spe
ci
fic
model
.
x
Inse
rt memory
card
BEFORE turning
p
o
w
e
r
ON
.
M
e
m
o
ry
card
m
a
y
be remov
ed after
d
a
ta i
s
loaded.
x
Error
code
w
ill be
cleared
on
ce
data i
s
loaded.
x
Turn pow
er off
befo
re
remov
ing memor
y
c
a
rd
x
Air hand
ler
blow
er fails to
opera
te
.
x
Inte
grated con
trol
module
LED
displa
y
prov
ides
indi
cated error code
.
x
ComfortNe
t™
ther
mosta
t “Call for
Serv
ice” icon il
lumi
nated
.
x
ComfortNe
t™
ther
mosta
t
scroll
s
“Check Air
Handle
r”
message
.
d1
x
Inv
alid data
on
netw
ork.
IN
VALID
DATA
d1
x
Air hand
ler
blow
er does not
contain an
ap
propri
ate shar
ed
data
se
t.
x
Populate
corre
ct sh
ared
da
ta
s
e
t us
in
g me
mo
ry
ca
rd
.
x
Turn pow
er OFF pri
or to
repair
x
Use memory
card
for
the spe
ci
fic
model
.
x
Inse
rt memory
card
BEFORE turning
p
o
w
e
r
ON
.
M
e
m
o
ry
card
m
a
y
be remov
ed after
d
a
ta i
s
loaded.
x
Error
code
w
ill be
cleared
on
ce
data i
s
loaded.
x
Operati
on di
fferen
t
than
ex
pected
or
n
o
operatio
n.
x
Inte
grated con
trol
module
LED
displa
y
prov
ides
indi
cated error code
.
x
ComfortNe
t™
ther
mosta
t “Call for
Serv
ice” icon il
lumi
nated
.
x
ComfortNe
t™
ther
mosta
t
scroll
s
“Check Air
Handle
r”
message
.
d4
x
Inv
alid m
e
m
o
ry
car
d
data
.
IN
VALID
MC
D
A
T
A
d4
x
Shared data
set
on
memory
card
ha
s bee
n re
je
cted
by
integra
ted
co
ntro
l
module
x
Verify
shar
ed da
ta
set i
s
corre
ct for the
s
pecific
model
.
Re-populate
da
ta
u
s
ing
corre
ct
m
e
m
o
ry
car
d if
required
.
x
Turn pow
er OFF pri
or to
repair
x
Use memory
card
for
the spe
ci
fic
model
.
x
Inse
rt memory
card
BEFORE turning
p
o
w
e
r
ON
.
M
e
m
o
ry
card
m
a
y
be remov
ed after
d
a
ta i
s
loaded.
x
Error
code
w
ill be
cleared
on
ce
data i
s
loaded.
x
Turn pow
er off
befo
re
remov
ing memor
y
c
a
rd
