Page 48
SERVICING AND MAINTENANCE
FAULT FINDING
Che
ck
pl
um
bi
ng
TS
fu
ll
of
w
at
er?
W
ate
r
m
ai
ns
o
n?
PH
E
pi
pe
wo
rk
air
lo
cke
d?
Che
ck
se
ns
ors
Ov
er
he
at
lin
k
pr
ese
nt
in
J7
Se
nso
rs
pl
ug
ge
d
in
se
cu
rely?
Sen
sor
s p
rov
id
in
g
cor
rect
sig
na
l t
o
PC
B?
Che
ck
El
ect
rical
suppl
y
Elect
rica
lly
sa
fe
?
Co
m
po
ne
nt
s
sh
or
t c
ircu
ited
?
W
iri
ng
a
s pe
r
ci
rc
ui
t di
ag
ram
?
Pum
p
LE
D
on
?
N
Ch
eck
c
ab
le
con
nect
ion
s
ecu
re
an
d
res
ist
an
ce
in
ca
ble
Pum
p
run
ni
ng
?
LED
is
da
m
ag
ed
pu
m
p
re
pl
ac
em
ent
o
pt
io
na
l
OK
?
Y
Reso
lv
e
N
Elect
ron
ics
d
am
ag
ed
rep
la
ce
pum
p
LE
D
Bl
inks r
ed?
Y
Y
Che
ck
fo
r bl
oc
kag
e
in
pi
pe
wo
rk
or
p
um
p
ho
us
ing
N
LED
con
tin
ues
to
Blin
k
red
a
fter
p
ow
er
re
set
Y
M
ot
or
o
r El
ec
tr
oni
cs
da
m
ag
ed
re
pl
ac
e
pu
m
p
OK
?
OK
?
OK
?
OK
?
OK
?
OK
?
OK
?
W
iri
ng
a
s pe
r c
irc
ui
t di
ag
ram
&
p
ola
rit
y
cor
rect
?
OK
?
OK
?
Sen
sor
s in
cor
rect
loca
tion
?
OK
?
OK
?
OK
?
N
OK
?
OK
?
LE
D
Bl
inks r
ed
&
gr
een
?
Reso
lv
e
OK
?
U
nder
v
ol
tag
e
U<
160
V
or
Over
vo
ltag
e U>
253
V
Reso
lv
e
OK
?
Pum
p
ov
er
he
at
ing
: C
hec
k
wat
er
an
d
am
bi
ent
te
m
pe
rat
ur
es
Reso
lv
e
Pum
p
O
ve
r s
pe
ed
E
ns
ur
e t
ha
t t
he
re
is
no
oth
er
ex
ter
na
l f
low
(ot
he
r
pu
m
p
run
ni
ng
) on
sy
st
em
OK
?
Reso
lv
e
O
ve
r c
ur
re
nt
t
he
st
at
or
wi
nd
ing
is in
sh
or
t c
ircu
it
due
to
wat
er
. C
he
ck
for
lea
k
OK
?
Reso
lv
e
Ov
er
loa
d
of
m
ot
or
: f
rict
ion
d
ue
to
pa
rt
icles
or
im
pe
llor
b
lock
ed
. C
lea
n
de
br
is
fr
om
sys
tem
N
ot
e p
um
p
wi
ll
re
st
ar
t b
y i
tse
lf
whe
n
the
fau
lt
di
sa
pp
ear
s
OK
?
Reso
lv
e
LE
D
Bl
ink
s gr
ee
n?
N
or
m
al
st
opp
ed:
pu
m
p
in
st
an
db
y
N
or
m
al
run
ni
ng
: p
um
p
run
s ac
co
rdi
ng
to
P
W
M
si
gna
l an
d
the
L
ED
wi
ll
be
c
ons
tan
tly
o
n
Y
N
Che
ck
board
out
put
to
pum
p
Ch
ec
k
po
we
r o
ut
pu
t t
o
pu
m
p
J8
L(
10)
,
N(8
),
E(6
)
Ch
ec
k
PW
M
fr
eq
uen
cy
Che
ck
Du
ty
Cy
cle
Y
Bo
ard
el
ect
ro
nics
da
m
ag
ed
N
Sop
his
tica
ted
m
ul
ti
m
et
er
av
ai
lab
le
Y
N
OK
?
OK
?
N
N