42
T
ROUBLESHOOTING
C
HART
Com
fortNetTherm
ostat
Only
Sym
ptom
s of A
bnor
m
al Opera
ti
on
(Non-Com
m
u
nicating
& Co
m
fo
r
tNet™
Therm
ost
at
D
ia
g
no
st
ic
/St
atus
LED Codes
Fault De
scr
ipt
ion
Messa
ge
Code
P
o
ss
ib
le C
a
u
se
s
Correct
ive Action
s
No
tes
& Ca
utio
ns
x
Op
erat
ion
di
fferent
than
ex
pected
o
r no
op
era
ti
on.
x
Int
egr
ate
d c
o
ntr
o
l m
o
du
le L
E
D
di
sp
lay
p
rovi
des
d
4
err
o
r c
o
de.
x
Com
fortNet
therm
ostat “
C
all for Se
rvice”
ico
n il
lum
ina
te
d
.
x
Com
fortN
et
th
erm
ost
at sc
rolls “
C
heck
Fur
nace” m
essa
ge.
d
4
x
In
valid
m
e
m
o
ry
card
dat
a.
INVALID MC
DATA
d4
x
Share
d
data se
t on m
e
m
o
ry
card
has
bee
n rej
ec
te
d by
inte
gr
ate
d
co
ntr
o
l m
odule
x
Verify
share
d data
se
t is c
o
rrec
t
for the
specific m
ode
l. Re-
po
p
u
la
te
da
ta u
sin
g c
o
rrec
t
m
e
m
o
ry
card if re
quired.
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir
x
Use m
e
m
o
ry
card for
the
spe
cif
ic m
odel.
x
Insert m
e
m
o
ry
card
BEFORE t
u
rn
ing
power
O
N
. Mem
o
ry
card
m
ay
be
rem
oved af
ter
dat
a i
s
loa
de
d.
x
T
u
rn
pow
er
O
F
F bef
ore
rem
oving m
e
m
o
ry
ca
rd.
x
Error c
ode w
ill be cle
ared
once
data is loaded.
x
Fur
nace
fa
ils to opera
te.
x
Int
egr
ate
d c
o
ntr
o
l m
o
du
le L
E
D
di
sp
lay
p
rovi
des
b
0
err
o
r c
o
de.
x
Com
fortNet
therm
ostat “
C
all for Se
rvice”
ico
n il
lum
ina
te
d
.
x
Com
fortN
et
th
erm
ost
at sc
rolls “
C
heck
Fur
nace” m
essa
ge.
b
0
x
Circ
ul
at
or bl
ow
er
m
o
tor
is
n
o
t ru
nni
ng
wh
en
it
shou
ld
be runn
ing
.
MOTOR NOT
RUN
b0
x
L
o
o
se w
ir
in
g
c
o
nne
ct
io
n a
t
circ
ul
at
or m
o
tor
pow
er lea
d
s or
circ
ul
at
or m
o
tor
pow
er lea
d
s
di
sc
on
ne
cte
d.
x
Op
en
ci
rcui
t i
n
i
ndu
cto
r
o
r lo
os
e
w
iri
ng c
o
nn
ec
ti
on a
t i
n
d
u
ct
o
r
(3/
4 H
p
a
n
d 1 H
p
m
odel
s
on
ly
).
x
Fail
ed
ci
rcul
ato
r
b
lower
m
o
to
r.
x
Tighte
n
or c
o
rrec
t wiring
co
nne
ct
ion.
x
Veri
fy
co
nt
in
uou
s ci
rcu
it
thr
o
u
g
h
in
d
u
ct
or. Re
pla
ce if
op
en
or s
h
ort c
irc
u
it.
x
Ch
eck
ci
rcu
lato
r blower
m
o
to
r.
Replace if
nece
ssa
ry
.
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir
x
Replace induc
tor
w
ith
corre
ct re
placem
ent
part.
x
Replace c
irc
ulator m
o
tor
with cor
rec
t re
pla
cem
ent
par
t.
x
Fur
nace
fa
ils to opera
te.
x
Int
egr
ate
d c
o
ntr
o
l m
o
du
le L
E
D
di
sp
lay
p
rovi
des
b
1
err
o
r c
o
de.
x
Com
fortNet
therm
ostat “
C
all for Se
rvice”
ico
n il
lum
ina
te
d
.
x
Com
fortN
et
th
erm
ost
at sc
rolls “
C
heck
Fur
nace” m
essa
ge.
b
1
x
Int
egr
ate
d c
o
ntr
o
l
m
odule has lo
st
co
mm
u
n
icatio
ns
wit
h
circ
ul
at
or bl
ow
er
m
o
tor.
MOTOR
COMM
b1
x
L
o
o
se w
ir
in
g
c
o
nne
ct
io
n a
t
circ
ul
at
or m
o
tor c
o
nt
rol
lea
d
s.
x
Fail
ed
ci
rcul
ato
r
b
lower
m
o
to
r.
x
Fail
ed
i
n
te
g
rat
ed
co
ntro
l m
o
du
le
.
x
Tighte
n
or c
o
rrec
t wiring
co
nne
ct
ion.
x
Ch
eck
ci
rcu
lato
r blower
m
o
to
r.
Replace if
nece
ssa
ry
.
x
Ch
eck
int
eg
rated
cont
rol
m
odule. Re
pla
ce if
n
eces
sary
.
x
T
u
rn
pow
er O
FF pr
io
r to
repa
ir
x
Replace c
irc
ulator m
o
tor
with cor
rec
t re
pla
cem
ent
par
t.
x
Replace inte
gra
te
d
contr
o
l
m
odule w
ith
cor
rec
t
replacem
ent part.
x
Fur
nace
fa
ils to opera
te.
x
Int
egr
ate
d c
o
ntr
o
l m
o
du
le L
E
D
di
sp
lay
p
rovi
des
b
2
err
o
r c
o
de.
x
Com
fortNet
therm
ostat “
C
all for Se
rvice”
ico
n il
lum
ina
te
d
.
x
Com
fortN
et
th
erm
ost
at sc
rolls “
C
heck
Fur
nace” m
essa
ge.
b
2
x
Circ
ul
at
or bl
ow
er
m
o
tor
hor
se
pow
er
i
n
s
h
are
d
dat
a se
t d
o
es
n
o
t m
atch
circ
ul
at
or bl
ow
er
m
o
tor
hor
se pow
er
.
MOTOR
MIS
M
ATCH
b2
x
Inc
orrec
t c
irc
ulator blower m
o
tor
in f
u
rn
ace.
x
Inc
orrec
t
sh
ar
ed da
ta set in
in
te
gra
te
d co
n
tro
l m
odu
le.
x
Verify
circula
tor
blower
m
o
tor
hor
se
pow
er
i
s t
h
e s
am
e
spe
cif
ie
d f
o
r the s
p
ec
ific fur
n
ac
e
m
odel. Replace
if necessary
.
x
Verify
share
d data
se
t is c
o
rrec
t
for the
specific m
ode
l. Re-
po
p
u
la
te
da
ta u
sin
g c
o
rrec
t
m
e
m
o
ry
card if re
quired.
x
T
u
rn
pow
er O
FF pr
io
r to
repa
ir
x
Replace m
o
tor w
ith
corre
ct re
placem
ent
part.
x
Use m
e
m
o
ry
card for
the
spe
cif
ic m
odel
x
Insert m
e
m
o
ry
card
BEFORE t
u
rn
ing
power
O
N
. Mem
o
ry
card
m
ay
be
rem
oved af
ter
dat
a i
s
loa
d
ed
.
x
T
u
rn
pow
er
O
F
F bef
ore
rem
oving m
e
m
o
ry
ca
rd.
x
Error c
o
de w
ill be cle
ared
once share
d
data and
m
o
tor horse
power m
atc
h.
x
Fur
n
ace
opera
tes a
t r
educe
d
pe
rform
ance.
x
A
irfl
ow
de
li
ve
red is l
ess t
h
an
ex
pec
te
d.
x
Int
egr
ate
d c
o
ntr
o
l m
o
du
le L
E
D
di
sp
lay
p
rovi
des
b
3
err
o
r c
o
de.
b
3
x
Circ
ul
at
or bl
ow
er
m
o
tor
is op
era
ti
ng i
n
a
p
o
w
er,
tem
perature, or
spee
d
li
m
it
ing
cond
it
ion
.
MOTOR
LIMITS
b3
x
Bl
ocked
fi
lt
ers
.
x
Restrictive duc
twor
k.
x
Un
d
ersi
ze
d
du
ct
wo
rk.
x
High am
bient tem
per
atures.
x
Chec
k f
il
ter
s for
b
loc
ka
ge.
Clea
n fi
lt
er
s or rem
ove
ob
st
ru
ct
io
n.
x
Chec
k
d
u
ct
w
o
rk f
o
r b
loc
ka
ge.
Rem
ove ob
st
ru
ct
io
n.
V
erify
all
regis
ter
s are f
u
lly
ope
n.
x
V
erify
duc
tw
or
k i
s ap
pro
pr
ia
te
ly
siz
ed f
o
r
sy
stem
.
Resize
/re
pla
ce
ductw
ork if
nece
ss
ar
y
.
x
See
"P
rodu
ct
Des
cr
ipt
ion"
an
d
"L
oc
at
ion R
equ
ir
em
en
ts
&
Con
si
dera
tio
ns"
fo
r f
u
rnace
in
st
all
at
ion
requi
rem
en
ts
.
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir.
