Float Switch - GE GDWT668V Technical Service Manual

Float Switch

The fl oat switch activates if water reaches the
fl oat stem inside the dishwasher. The switch only
terminates the voltage to the water valve.
To remove the fl oat switch:
1. Remove the two 1/4-in. hex-head screws and
the access panel.
2. Disconnect the fl oat switch wire harness.
3. Remove the 2 Phillips-head screws holding the
switch to the dishwasher.
4. Pull the fl oat switch out of the bracket.
Disconnect
Turbidity Sensor
The turbidity sensor measures the amount of
suspended particles in the wash water in the sump.
The sump water lays within the 1/4- to 3/8-in. gap
between the LED transmitter and the receptor
during the designated fi lls. Successive turbidity
measurements are supplied to the control module
and used to determine whether to add or skip any
prewash or rinse cycles and whether to adjust the
wash or heat times. By measuring the turbidity level,
the control module can conserve energy on lightly
soiled loads by skipping unnecessary cycles. If the
soil level is high, the control module adds one or
more rinse cycles and increases the wash and heat
times as necessary.
Note: If the turbidity sensor fails, the unit operates
for the maximum amount of time, using the
maximum number of wash and rinse fi lls for the
selected cycle.
The turbidity sensor can be tested by checking the
resistance across the wires on the control board at
J3, pin 1 (yellow/black wire), and J3, pin 4 (orange
wire). (See
Control Board Connect Locator View
thermistor's resistance has a negative temperature
coeffi cient.
• At 75°F, the resistance is approximately 9.9 K.
• At 140°F, the resistance is approximately 2.8 K
Control Board
1
TURBIDITY/
2
TEMPERATURE
3
SENSOR
J3
4
– 31 –
.) The
Turbidity Sensor
YB
1
NTC
NX
2
RECEIVER EMITTER
SX
3
TRANSMITTER
OX
CATHODE
4
Vcc
(Continued next page)