24
25 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
M
essage Code
Possible
Causes
Correct
iv
e A
c
tions
Notes & Cauti
ons
x
LED di
splay
is
ON
continuou
sly
ON
x
Normal
opera
tion
None None
x
Normal
opera
tion
x
None
x
Normal
opera
tion
x
Elec
tri
c hea
ter
s
fail
to e
nergi
ze o
n
a
call
for
W1
or
Aux
iliary
/Emergency
heat
x
Inte
grated con
trol
module
LED
displa
y
prov
ides the
indi
ca
ted erro
r
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
EC
x
Heater ki
t sele
cted v
ia
dipsw
itche
s is too
large for
hea
ter ki
ts
spe
cifie
d in
shared
data
se
t
HTR TOO
LARGE
EC
x
Heater ki
t sele
cted v
ia
dipsw
itche
s is too l
a
rge
for
heater
kits i
n
share
d da
ta
se
t
x
Verify
electri
c heat dipsw
itch
set
ting
s
x
Verify
the
in
stal
led
electric
heater
i
s
v
a
lid fo
r
th
e air
handler blow
er.
Check
nameplate
or
Spe
ci
fica
tion
Sheet appli
cable
to
y
our
model*
for
allow
able hea
ter
kit(
s)
.
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
Turn p
o
w
e
r off be
fore
remov
ing memor
y
c
a
rd
.
x
Electri
c hea
t air
flow
is highe
r
than
ex
pected on
a
ca
ll
for
W1
or
Aux
iliar
y
/Emergency
heat
x
Inte
grated con
trol
module
LED
displa
y
prov
ides the
indi
ca
ted erro
r
code
.
EC
x
Heater ki
t sele
cted v
ia
dipsw
itche
s is too
small
for
hea
ter
ki
ts
spe
cifie
d in
shared
data
se
t
HTR TOO
SM
ALL
EC
x
Heater ki
t sele
cted v
ia
dipsw
itche
s is too
small fo
r
heater
kits i
n
share
d da
ta
se
t
x
Verify
electri
c heat dipsw
itch
set
ting
s
x
Verify
the
in
stal
led
electric
heater
i
s
v
a
lid fo
r
th
e air
handler blow
er.
Check
nameplate
or
Spe
ci
fica
tion
Sheet appli
cable
to
y
our
model*
for
allow
able hea
ter
kit(
s)
.
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
Turn pow
er off
befo
re
remov
ing memor
y
c
a
rd
.
x
Electri
c hea
t air
flow
is highe
r
than
ex
pected on
a
ca
ll
for
W1
or
Aux
iliar
y
/Emergency
heat
x
Inte
grated con
trol
module
LED
displa
y
prov
ides the
indi
ca
ted erro
r
code
.
EC
x
Heater ki
t sele
cted v
ia
dipsw
itche
s doe
s n
o
t
heater
kits
spe
ci
fie
d
in
shared
da
ta
se
t
NO HTR
M
A
T
CH
EC
x
Heater ki
t sele
cted v
ia
dipsw
itche
s is doe
sn’t ma
tch
heater
kits i
n
share
d da
ta
se
t
x
Verify
electri
c heat dipsw
itch
set
ting
s
x
Verify
the
in
stal
led
electric
heater
i
s
v
a
lid fo
r
th
e air
handler blow
er.
Check
nameplate
or
Spe
ci
fica
tion
Sheet appli
cable
to
y
our
model*
for
allow
able hea
ter
kit(
s)
.
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
Turn pow
er off
befo
re
remov
ing memor
y
c
a
rd
.
x
Inte
grated con
trol
module
LED
displa
y
EF error
code.
x
ComfortNe
t™
ther
mosta
t “Call for
Serv
ice”.
EF
x
Aux
sw
itch open
Aux
Alarm
Fault
EF
x
High w
ater lev
el in
the
ev
aporation coil.
x
Check ov
erflow
pan and
serv
ice
x
Turn pow
er OFF pri
or to
serv
ice.
