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

Page: 81 / 96

is
Release R
.1.3
UK
81
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
.
C02
(l
oc
k ou
t er
ror
)
Error message
from
the water hea
ter
controll
er
.
Incorr
ect reference
vo
lta
ge from
the AD
co
nverter
.
1.
R
eset the
T
hermoCo
ntro
l.
2.
C
heck tha
t the fre
que
ncy
o
f the ma
ins pow
er
co
mp
lies with
tabl
e 3.8.
If this is not
the
ca
se
, cont
act
yo
ur
in
st
a
lle
r.
3.
If the
frequ
ency
is co
rre
ct
but
th
e e
rror p
ersist
s,
re
pla
ce
the
T
hermoC
ontrol.
To
rep
lace
the
ne
ce
ssary p
a
rt
s, yo
u mu
st
cont
act you
r in
st
al
ler
.
Internal error
message
fr
om
the water heat
e
r
controll
er
.
E
EPROM read
error
.
50 Hz
e
rro
r.
Int
ern
al
co
m
m
un
ic
at
io
n err
o
r
Internal error
message
fr
om
the water heat
e
r
controll
er
.
Gas
valve relay err
o
r.
S
a
fety relay
error
.
Ig
ni
tio
n re
la
y
err
o
r.
RAM
error
.
E
EPROM err
o
r.
EEPROM conten
ts
d
o
not ma
tch the sof
tware
ve
rsi
on.
P
roc
essor sof
tware
error
.
Ta
ble
10.2
Displ
ayed errors (Shee
t 9 of
1
0)
Co
de
+
De
scrip
tio
n
Po
ss
ib
le
c
aus
e
S
o
lu
tio
n
R
emar
k