Sh
o
r
t
flas
h,
on
c
e
e
v
e
ry
fo
ur
se
c
on
d
s
“
H
ea
r
tbeat
”
,
alte
r
nates
b
ri
g
h
t
/
dim
T
h
e
rm
ostat
c
all
i
n
g
fo
r h
eat
(
no
fa
u
lt
).
Sh
o
r
t
flas
h
on
c
e
p
e
r
se
c
on
d
W
ea
k pi
lot
s
i
g
nal
on
last
c
all
fo
r h
eat
.
T
w
o
flas
h,
t
hr
ee
se
c
on
d
p
a
u
se
P
r
ess
ur
e
s
wi
t
ch
not
w
o
rki
n
g
-c
lose
d
p
os
i
t
i
on
.
T
hr
ee
flas
h,
t
hr
ee
se
c
on
d
p
a
u
se
P
r
ess
ur
e
s
wi
t
ch
o
r
blo
w
e
r
te
mp.
s
wi
t
ch
not
w
o
rki
n
g
-
o
p
en
p
os
i
t
i
on
.
F
o
ur
flas
h,
t
hr
ee
se
c
on
d
p
a
u
se
E
x
ce
ssiv
e tan
k
temperat
u
re
.
Sys
tem m
us
t be
re
s
et
.
Fiv
e
flas
h,
t
hr
ee
se
c
on
d
p
a
u
se
U
n
d
es
ir
e
d-
false
pi
lot
fla
m
e
pr
esent
.
LED
Status
S
tan
d-
b
y m
o
d
e
,
W
a
i
t
i
n
g
fo
r c
all
fo
r
h
eat
(
no
fa
u
lt
).
C
ontrol
Status
Service
Procedure
Probable
C
ause
Te
mp
e
r
at
ur
e
d
e
m
an
d i
s
sat
i
sf
i
e
d
N
o
rm
al
o
p
e
r
at
i
on
.
A
dju
st
t
h
e
rm
ostat
to
d
es
ir
e
d
te
mp.
le
v
el
.
Tan
k
te
mp
e
r
at
ur
e
belo
w
set
p
o
i
nt
of
t
h
e
rm
ostat
.
N
orma
l
operat
i
on
.
A
d
j
us
t t
h
ermo
s
tat to
d
e
si
re
d
temp
. l
e
v
e
l.
1
.
U
n
s
tab
l
e p
i
l
ot
.
2
.
Pi
l
ot t
u
be b
l
oc
k
e
d
or re
s
tr
i
cte
d
.
3.
O
x
id
at
i
on b
ui
l
d u
p on p
i
l
ot e
l
ectro
d
e
.
4.
Wi
re
d
ama
g
e to p
i
l
ot a
ss
emb
l
y
or ba
d
connect
i
on at
g
a
s v
a
l
v
e
.
1
-
4.
P
age 18
1
.
P
re
ssu
re
swi
tc
h
t
u
b
i
n
g
k
i
n
k
e
d
or b
l
oc
k
e
d
.
2
.
B
l
oc
k
e
d
pre
ssu
re tap on
swi
tc
h
or b
l
o
w
er
.
3. F
a
u
l
t
y
pre
ssu
re
swi
tc
h
.
1
-
3
.
P
age 19
1
. V
ent b
l
oc
k
a
g
e or
i
mproper
v
ent con
figu
rat
i
on
.
2
.
P
re
ssu
re
swi
tc
h
t
u
b
i
n
g
k
i
n
k
e
d
or b
l
oc
k
e
d
.
3. F
a
u
l
t
y
pre
ssu
re
swi
tc
h
.
4.
B
l
o
w
er not
s
p
i
nn
i
n
g u
p to
s
pee
d
.
5.
B
l
o
w
er temp or e
x
h
a
us
t temp too
high
6. F
a
u
l
t
y
b
l
o
w
er temperat
u
re
swi
tc
h
.
7. I
nta
k
e
v
ent
l
en
g
t
h
e
x
cee
ds
e
x
h
a
us
t
v
ent
l
en
g
t
h
.
8. F
ro
z
en
i
nta
k
e or e
x
h
a
us
t
v
ent term
i
na
l.
1.
Ch
e
ck v
e
nt or v
e
nt t
a
bl
e
s
.
2 & 3
.
P
age 19
4.
P
age
2
1
5
& 6
.
P
age
23
8.
P
age 41
1
.
Th
erma
l
w
e
ll
s
en
s
or o
u
t o
f
ca
l
i
brat
i
on
.
2
. F
a
u
l
t
y g
a
s
contro
l.
3.
P
l
u
mb
i
n
g
l
ea
k
1
-
2
.
R
e
pl
a
c
e ga
s control,
p
age
3
1
1
.
Pi
l
ot
v
a
l
v
e
s
t
u
c
k
i
n open po
si
t
i
on
.
1.
R
e
pl
a
c
e ga
s control,
p
age
3
1
N
one
, c
ont
r
ol
L
E
D
not
on
o
r
flas
hi
n
g
N
o
ele
c
t
ric
al
p
o
w
e
r
Cont
r
ol
p
o
w
e
r
s
wi
t
ch i
n
“
OFF
”
p
os
i
t
i
on
.
Supp
l
y v
olta
g
e
i
nte
rrup
te
d.
T
ur
n
p
o
w
e
r
on
.
Observe
green
LED
indicator
on
Electronic
gas
control.
Error
flash
codes
are
displayed
with
a
three
second
pause
before
repeating.
C
hec
k
and
repair
the
system
as
noted
in
the
troubleshooting
table
below.
G
r
een
L
E
D
I
n
dic
ato
r
T
r
ou
b
leshootin
g
UPDX
Series
P
a
g
e
1
4
(The following chart is for models with serial numbers starting with K or later.)
14
Содержание UPDX series
Страница 44: ......
