Manual

24
ELECTRICAL SERVICE
Dual Float Troubleshooting Diagrams:
Dual Float Switches –
Troubleshooting:
The dual float controls fill and heat circuits.
Identifying a Dual Float Problem:
The most common trouble conditions associated with a dual float failure are:
1. The tank fills constantly.
2. The tank heat will not come on.
Inspect the Dual Float:
1. Be sure that the dual float assembly is clean and free of scale build-up.
2. Be sure that the stainless steel balls on the float assembly move up and down freely.
In addition to checking the float operation, perform the following—
System Checks:
1. All drain valves are fully closed.
2. Incoming water supply Flow Pressure is 20-22 psi [138-151 kPa].
3. Fuses in control cabinet are good (Electric Heat Only).
4. Tank Heat thermostats and/or High limit thermostats operate correctly.
5. Booster Heat thermostats and/or High limit thermostats operate correctly.
YE
S
W
a
ter
S
huts
O
FF
M
ac
hin
e
i
s
i
n
Final Rinse Mod
e
Not
a
D
ua
l Flo
at
Pro
b
l
e
m
S
y
stem
C
hec
k
s
S
y
ste
m
C
heck
s
YE
S
YE
S
YE
S
YE
S
YE
S
YE
S
N
O
N
O
N
O
N
O
N
O
N
O
N
O
W
as
h or Pr
e
w
ash
T
ank Fills Constantly
TT
Is
T
ank Ful
T
T
l
o
fW
a
t
e
r
?
Ar
e
th
e
Flo
at
Balls U
p?
C
los
e
Dr
ai
n
V
a
lv
e
C
lea
n
Flo
at
Ass
y
Is Heat
ON
wh
e
n
ca
ll
e
d
f
o
r
?
Re
p
lac
e
D
ual
Flo
a
t
Chec
k
S
oleno
i
d
V
a
lv
e
Ar
e
th
e
Flo
at
Balls U
p?
C
hec
k
S
olenoi
d
V
alv
V
V
e
Is Heat
ON
w
h
e
n
ca
ll
ed
f
o
r
?
Re
p
la
c
e
D
ual
Flo
at
C
lea
n
Flo
at
A
ss
y
C
lo
s
e
Dr
a
i
n
V
alve
V
V
Is
T
ank Ful
T
T
l
o
fW
a
t
e
r
?
C
heck to ensu
r
e
th
at
Rinse-
S
aver Leve
r
i
s
no
t
O
p
erate
d
W
a
ter Runs Constantl
y
Throu
g
h Final Rinse Pipi
n
g