A.O. Smith 28 30 50 60, Installation & Service Manual

Page: 82 / 96

is
Release R
.1.3
UK
82
Wa
rn
in
g
Ma
intena
nce may
o
nly be pe
rformed
b
y a
qu
alifie
d se
rvi
ce and main
te
nance
e
ngin
eer
.
C03
(b
lo
ckin
g
err
o
r)
Reset error
.
To
o many re
se
ts
in
to
o
sh
ort a
pe
riod.
W
ai
t for the
error to
disa
ppea
r (ma
ximum 1 ho
ur).
If the e
rro
r does
no
t di
sa
ppe
ar
, th
e water heater
controll
er
mu
st be repl
aced.
To
rep
lace
the
ne
ce
ssary p
a
rt
s, yo
u mu
st
cont
act you
r in
st
al
ler
.
C04
(b
lo
ckin
g
err
o
r)
Appl
iance
sel
ection
error
.
Inco
rre
ct app
lia
nce
se
lection
/
Inco
rre
ct sele
ct
io
n
re
sistor
.
1.
C
heck whether the correct
a
ppli
ance ha
s
be
en sele
cte
d. See
’9
.5
D
ispla
y the
sele
cte
d a
ppl
iance
’
.
2.
If the
correct
appl
ian
ce
is
sel
ecte
d, fit the
corre
ct
selectio
n
res
istor
.
3.
If i
ncorrect a
ppli
ance
sele
ct
ed,
select the correct
one.
If the
e
rro
r do
es
not d
isapp
ear
, you
must
co
nt
act
you
r
in
st
al
ler
.
To
o
bt
a
in a sele
ctio
n re
sisto
r,
you must con
tact yo
ur inst
alle
r.
E01 (blo
cking
erro
r)
Th
e te
mp
erature
protection
at the
top
of
the t
a
nk
h
as been
activated.
The
te
mperature of th
e
water
a
t the to
p of
the
ta
n
k i
s
>
85°C.
No
ne.
T
his is a te
mp
orary me
ssa
ge that ma
y ap
pea
r from
time to
time, b
ut wi
ll
disa
ppea
r au
to
ma
tically
.
E03 (blo
cking
erro
r)
Error i
n
te
mp
erature
senso
r T
1
at the
to
p o
f
the t
a
nk.
T
he te
mp
er
at
ure
dif
ferentia
l b
etween
the
two
tempera
ture
se
nsors in
the
ta
nk is
>
10°C over a perio
d of
60 second
s
o
r lo
nger
.
1.
C
heck se
nsor positio
n and wiri
ng.
2.
R
eset
the T
hermoCo
ntro
l if
ne
cessary
. Rep
lace the senso
r if
th
e er
ror
p
e
rs
ist
s.
To
rep
lace
the
ne
ce
ssary p
a
rt
s, yo
u mu
st
cont
act you
r in
st
al
ler
.
E04 (blo
cking
erro
r)
Error in
the dummy
senso
r
(2)
.
The
two
du
mmy
se
nsors
detect
a
dif
ferentia
l o
f
>
10°C
over
a p
eriod
o
f 60
se
conds or lon
ger
.
1.
C
heck
wiring
from dummy 1
an
d
dummy 2
.
2.
R
eset Th
ermoCon
trol
if ne
ce
ssary
. R
epla
ce the d
ummy sensor
if the error persist
s.
To
rep
lace
the du
mmy sensor you must
con
ta
ct your inst
all
er
.
1.
Te
mpera
tur
e sen
so
r
T
1
is
a ‘2 in 1’ sensor
,
T
1
cont
ai
ns
2
NTCs
fo
r t
he high-
limit
t
her
most
at
a
nd
sa
fet
y t
h
ermost
at
p
rot
ecti
on.
2.
The dummy se
nsor co
nsist
s
of
du
m
m
y se
ns
or
1
an
d
d
u
m
m
y se
ns
or
2
3.
The dummy se
nsor co
nsist
s
of
du
m
m
y se
ns
or
1
an
d
d
u
m
m
y se
ns
or
2
Ta
ble
10.2
Displ
ayed errors (Shee
t 10 of 10)
Co
de
+
De
scrip
tio
n
Po
ss
ib
le
c
aus
e
S
o
lu
tio
n
R
emar
k