75
Troubleshooting
Co
m
fo
r
tNet
Therm
ost
a
t On
ly
Sym
ptom
s of A
bnor
m
a
l Opera
ti
on
(N
on-c
o
m
m
unicat
in
g &
C
o
m
fortN
e
t™
Therm
ost
a
t)
D
ia
g
no
st
ic
/St
a
tus
LED Codes
Fault De
scr
ipt
ion
Messa
g
e
Code
P
o
ss
ib
le C
a
u
se
s
Correct
ive Action
s
No
tes
& Ca
utio
ns
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
IF
err
o
r c
o
de..
x
Com
fortNet
therm
o
stat “
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
if
x
Int
egr
ate
d
c
o
ntr
o
l
m
odule has
an
in
ter
n
al
fau
lt
INTERNAL
FAULT
EE
x
Im
proper
wir
ing to the
fur
n
ace
or in
te
gra
te
d
co
n
tr
o
l m
odu
le.
x
Assure proper w
iring to f
u
rn
ace
an
d i
n
te
gra
te
d
c
o
n
tr
o
l m
o
dule.
x
Verify
power to the f
u
rnace a
n
d
inte
gra
te
d
c
o
n
tr
o
l
m
odule i
s
s
tabl
e and
wi
thi
n
sp
eci
ficatio
ns
.
x
Replace
ba
d integr
ate
d control
m
odule.
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir.
x
Read prec
autions in
“E
lectros
tatic Disc
ha
rge”
sec
ti
o
n
of m
anua
l.
x
Replace inte
gra
te
d
contr
o
l
m
odule w
it
h
cur
ren
t
replacem
ent parts.
x
L
E
D
dis
p
lay
in
di
cat
es
O
n
O
n
x
Norm
al opera
tion
N
one N
one
x
Norm
al opera
tion
x
N
one
x
Norm
al opera
tion
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
E0
err
o
r code.
x
Com
fortNet
therm
o
stat “
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.
E0
x
Fur
nace lockout due
to
an e
x
ce
ss
ive num
ber of
ig
ni
ti
on
“
ret
ri
es
” o
r
flam
e “
rec
y
cles”
(3
to
ta
l).
LOCKOUT E0
x
Failur
e to es
ta
blish f
la
m
e. Cause
m
a
y
be
no gas to b
u
rn
er
s,
fro
n
t
co
ver p
res
su
re sw
it
ch
st
uc
k o
p
en
,
b
ad
ig
ni
ter or ig
ni
ter
al
ign
m
en
t,
im
proper or
ifi
ces, or
co
at
ed
/ox
id
ized
o
r i
m
p
rop
erl
y
conne
cte
d f
lam
e sens
or.
x
Los
s of f
lam
e after establishm
ent.
Cau
se m
a
y
be inte
rru
pte
d
gas
su
p
p
ly
, lazy
burne
r fl
am
es
(im
prope
r ga
s pr
es
su
re
or
rest
ricti
on
in
fl
ue and/
o
r
co
m
b
u
st
ion
ai
r
p
ipi
ng
), front
co
ver p
res
su
re sw
it
ch
ope
n
in
g
, or
im
proper
in
d
u
ce
d d
ra
ft b
low
er
perf
o
rm
ance.
x
Locate and c
o
rre
ct
ga
s
in
terr
u
p
ti
o
n.
x
Chec
k fr
on
t c
o
v
er pr
es
su
re
sw
it
ch
op
erat
ion
(hose, wi
rin
g
,
conta
ct
opera
ti
o
n
). Correc
t i
f
nece
ss
ary
. Make s
u
re
fur
n
ace
is
dra
in
ing pr
ope
rly
.
x
Replace
or rea
lign igniter.
x
Chec
k f
lam
e sense
signal. Sa
nd
se
nso
r i
f
co
at
ed
an
d/or o
x
id
iz
ed
.
x
Chec
k f
lue
p
ip
in
g
f
o
r bl
oc
ka
ge,
p
rop
er l
eng
th
, elbo
ws, an
d
term
inat
ion.
x
Veri
fy
p
rop
er ind
uced
d
raft
bl
ow
er perf
orm
ance.
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir.
x
Ig
nit
er is
fragi
le
,
h
and
le
with care.
x
Clea
n flam
e rod with
ste
el
wo
ol
.
x
See “
V
ent/Flue P
ipe
”
se
ct
ion
fo
r p
ipi
ng
d
etai
ls
.
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
E1
err
o
r
code.
x
Com
fortNet
therm
o
stat “
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.
E1
x
Lo
w s
tag
e
p
res
su
re
sw
it
ch c
irc
u
it
is c
lose
d
at
sta
rt
of heating cy
cle.
P
S1
CLOSED
E1
x
Lo
w
st
ag
e p
res
su
re
swi
tc
h
con
tacts
st
ickin
g
.
x
Sh
orts
in
pressu
re s
w
it
ch
ci
rcu
it
w
iri
ng.
x
Replace low sta
ge pr
ess
ure
swit
ch
.
x
Repa
ir s
h
or
t i
n
w
ir
in
g
.
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir.
x
Replace pre
ssure switch
with cor
rec
t re
pla
cem
ent
par
t.
x
In
du
ced
d
raft
blo
wer ru
ns
co
nti
nuo
usl
y
wi
th
no
furth
er fu
rn
ace op
erat
ion
.
x
Int
egr
ate
d
c
o
ntr
o
l m
o
du
le L
E
D
di
sp
lay
p
rovi
des
E2
err
o
r
code.
x
Com
fortNet
therm
o
stat “
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.
E2
x
Lo
w s
tag
e
p
res
su
re
sw
it
ch
ci
rc
u
it is no
t
close
d.
PS
1
OPEN
E2
x
Pres
su
re sw
it
ch
h
o
se
bl
oc
ke
d
pi
nc
he
d,
or c
o
nne
cte
d
im
pro
p
erly
.
x
Bl
ocked
fl
ue and/
o
r
in
le
t ai
r pip
e,
bl
oc
ke
d dr
ai
n sy
stem
or w
ea
k
in
d
u
ce
d dr
aft
bl
ow
er.
x
Inc
o
rrec
t pre
ssure switc
h
set point
or m
alfunc
ti
o
n
in
g
sw
itc
h
conta
cts.
x
Loose or im
properly
conne
cte
d
w
iri
ng.
x
In
du
cer not
run
nin
g
.
x
H
fitt
ing a
tm
o
sp
her
ic
por
t
bl
oc
ke
d.
x
In
sp
ect
p
res
su
re s
w
itch
hos
e.
Repa
ir
/re
pla
ce if
nec
es
sa
ry
.
x
Ins
p
ec
t f
lu
e an
d
/or
in
let a
ir
p
ipi
ng
fo
r bl
ockag
e,
p
rop
er
len
g
th,
e
lbow
s,
an
d te
rm
inat
ion.
x
Chec
k
drain
sy
stem
. Corre
ct
as
nece
ssary
.
x
Chec
k i
n
du
ce
d dra
ft
bl
ow
er
perf
orm
ance. Corr
ect as
nece
ss
ary
.
x
Co
rrect
p
res
su
re s
w
itch
set
p
o
in
t
or c
o
n
tac
t m
o
tio
n.
x
Tighte
n
or c
o
rrec
t wiring
co
nne
ct
ion.
x
Clea
n H
fi
tt
in
g.
x
T
u
rn
pow
er
O
FF pr
io
r to
repa
ir.
x
Replace pre
ssure switch
with cor
rec
t re
pla
cem
ent
par
t.
x
Replace induce
d
draf
t
blower with
corr
ec
t
replacem
ent part.
x
Take care
to
as
sem
b
le
/i
ns
tall
H fitt
ing
in fa
ct
ory
conf
igur
at
ion.
