63
Troubleshooting
Co
m
fo
r
tNet
Therm
ost
at On
ly
Sym
ptom
s of A
bnor
m
al Opera
ti
on
(N
on-c
om
m
unicat
in
g &
C
o
m
fortN
et™
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
Ci
rcu
lato
r
b
lo
w
er ru
ns
cont
inu
ou
sl
y
. No
fur
nace opera
tion.
x
Int
egr
ate
d c
o
ntr
o
l m
o
du
le L
E
D
di
sp
lay
p
rovi
des
E3
err
o
r
code.
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.
E3
x
Prim
ary
li
m
it.
HIGH
LIMIT
OPEN
E3
x
In
su
ffi
ci
en
t con
di
tio
ned
ai
r ov
er
the
hea
t e
x
ch
ange
r. Blo
ck
ed
filter
s, re
str
ic
tive
duc
twor
k,
im
proper
ci
rc
u
lat
or b
low
er sp
ee
d,
or fa
ile
d c
irc
ul
at
or b
lo
w
er m
o
tor.
x
Loose or im
properly
conne
cte
d
w
iri
ng.
x
Chec
k f
il
ter
s an
d
duc
tw
or
k fo
r
bl
oc
ka
ge.
Cle
an f
il
te
rs or
rem
ove ob
st
ru
ct
io
n.
x
Ch
eck
ci
rcu
lato
r blower s
p
eed
an
d per
form
ance. Correct
spee
d
or re
place blower m
o
tor
if
nece
ss
ary
.
x
Tighte
n
or c
o
rrec
t wiring
co
nne
ct
ion.
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir.
x
See Spe
cif
ica
ti
o
n
S
h
ee
t
ap
pl
ica
bl
e t
o
y
our m
o
del
for a
llowa
ble r
ise ra
nge
an
d pr
o
p
er c
irc
ula
tor
spe
ed.
x
Ind
uc
ed draf
t
b
lo
w
er an
d
cir
cu
la
tor b
low
er
ru
ns
co
nti
nuo
usl
y
.
N
o
fu
rn
ace op
erati
on
.
x
Int
egr
ate
d c
o
ntr
o
l m
o
du
le L
E
D
di
sp
lay
p
rovi
des
E4
err
o
r
code.
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.
E4
x
Flam
e sens
ed when
it
shou
ld
not
b
e
p
res
en
t.
IMPROPE
R
FLAME
E4
x
Sh
ort
t
o
g
ro
und
in
fl
ame s
en
se
circ
uit.
x
Linger
ing bur
ner f
la
m
e.
x
Slow
c
lo
sin
g g
as
va
lv
e.
x
Corre
ct
shor
t at f
lam
e sens
or or
in f
lam
e sensor wiring.
x
Chec
k f
o
r linger
ing f
la
m
e.
x
Veri
fy
p
rop
er op
eratio
n
o
f gas
valve. Re
place
if
nece
ssary
.
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir.
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
EC
err
o
r c
o
de.
x
Com
fortNet
therm
ostat “
C
all for Se
rvice”
icon
il
lu
m
inate
d.
x
Com
fortN
et
th
erm
ost
at sc
rolls “
C
heck
Furnac
e” m
essage.
EC
x
Induc
er m
o
tor
overc
urre
nt fault.
INDUCER
FAULT
OR
INDUCER
LOCKOUT
EC
x
Li
ng
eri
ng
In
du
cer mo
to
r
ov
erc
urre
nt de
tec
te
d.
x
Rese
t sy
stem
pow
er a
nd
ver
ify
i
n
du
cer is
runn
in
g
p
rop
erl
y
.
x
Replace inducer or
integrated
co
ntr
o
l m
odule,
if n
eces
sary
.
x
No fur
nac
e opera
tion.
x
Int
egr
ate
d c
o
ntr
o
l m
o
du
le L
E
D
di
sp
lay
p
rovi
des
E
d
err
or c
o
de.
E
d
x
Manu
al
reset
ro
llo
ut
sw
it
ch
i
s op
en
ROLLOUT
OPEN
Ed
x
Ori
fi
ce pl
at
e out
o
f
po
si
tio
n
.
x
Blocked hea
t
exchanger.
x
Bu
rn
ers
ou
t
o
f al
ignmen
t.
x
Defective he
at e
x
ch
an
ger.
x
L
ine up or
ifi
ce
p
la
te.
x
Rem
ove Blo
ck
age f
ro
m
heat
ex
ch
an
ge
r.
x
L
ine up b
u
rn
ers.
x
Chec
k f
o
r fl
am
e dist
u
rba
nce
on
ro
ll
out
wh
en
blo
wer
co
m
es
o
n
.
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir.
x
No fur
nac
e opera
tion.
x
Int
egr
ate
d c
o
ntr
o
l m
o
du
le L
E
D
di
sp
lay
p
rovi
des
Ef erro
r code.
EF
x
Open a
u
xiliary
input.
AUXILIARY
OPEN
EF
x
O
p
en
ci
rc
u
it betw
ee
n
aux in or
aux out.
x
Mi
ssi
ng
ju
m
p
er.
x
Op
en
f
lo
at
s
w
it
ch
..
x
Ins
ta
ll j
u
m
p
er.
x
Ins
pe
ct f
lo
at
sw
it
ch.
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir.
x
No fur
nac
e opera
tion.
x
Int
egr
ate
d c
o
ntr
o
l m
o
du
le L
E
D
di
sp
lay
p
rovi
des
E5
err
o
r
code.
x
Com
fortN
et th
erm
ost
at
d
is
p
lay
s
“B
attery
Power”.
E5
x
Op
en
Fus
e
No
t
Di
sp
la
y
ed
No
t
Disp
la
y
ed
x
Sho
rt in low
vo
lt
ag
e
w
iri
ng
x
Locate
and
co
rre
ct short in low
v
olt
age wi
ri
ng
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir.
x
Replace f
u
se with
3-a
m
p
aut
om
oti
ve ty
pe
x
Norm
al furnace oper
at
ion.
x
Int
egr
ate
d c
o
ntr
o
l m
o
du
le L
E
D
di
sp
lay
p
rovi
des
E6
err
o
r
code.
E6
x
Flam
e sens
e m
icro am
p
si
g
n
al is low
WE
A
K
FLAME
E6
x
F
la
m
e s
en
so
r
is
co
at
ed
/ox
id
iz
ed
.
x
Flam
e sens
or
inc
orr
ectly
.p
os
iti
on
ed
in
bu
rn
er
fl
am
e.
x
Lazy
burner f
lam
e due to
im
proper
ga
s pr
es
su
re
or
com
bus
tion air.
x
Clea
n flam
e sens
or if
co
at
ed
/ox
id
ized
.
x
In
sp
ect
fo
r prop
er
se
ns
o
r
al
ign
m
en
t.
x
Ch
eck
inl
et
ai
r p
ipi
ng
fo
r
bl
oc
ka
ge,
pr
o
p
er
len
g
th,
e
lb
o
w
s,
an
d term
ina
ti
o
n
.
x
Com
pare curr
ent gas
pre
ss
ure
to
rati
ng
pl
at
e. Ad
just
as
n
eed
ed
.
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir.
x
Clea
n flam
e sens
or with
st
eel
wool
.
x
See "
V
ent/
Flu
e Pi
pe"
se
ct
ion
fo
r p
ipi
ng
d
etai
ls
.
x
See rat
ing
pl
ate f
o
r
pr
op
er
gas pre
ssur
e.
