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The Thermistor is located inside the turbidity
sensor. The thermistor monitors water
temperature in the tub. If the thermistor opens or
shorts it will cause an error (see
Consumer Error
Mode
in the
Electronic Controls
section of this
service guide). If it fails in open or shorted, the
control will default to the longest time algorithm.
Thermistor Specifications
Turbidity Sensor Calibration
Calibration occurs every 100 cycles. After the
final rinse but before dry, the control will add three
extra rinse cycles. The first cycle will fill, circulate
two minutes and drain. The second cycle will
be a fill and drain. The third cycle will be a fill,
circulate, calibrate and drain. The cycle will now
advance to dry and complete.
Replacement controls will enter a calibration
at the end of the first cycle that the control
completes, as mentioned above. If the first cycle
is interrupted and calibration does not occur,
calibration will retry on the next cycle, until it is
completed. Calibration will not occur on demand.
Turbidity Sensor Diagnostics
If the turbidity sensor fails open or shorted, the
control will default to the maximum fills and
circulation time that the control is programmed for.
Use
Consumer Error Mode
to look for Turbidity
Sensor Faults.
VOLTAGE RESISTANCE TEMPERATURE
.95
20066
50°F
1.56
10450
75°F
2.25
5824
100°F
2.91
3411
125°F
3.48
2081
150°F
3.91
1330
175°F
To check the thermistor, access the Main Control
(see the
Electronic Controls
section of this
service guide), check resistance on connector
J806, pin 11, YR to pin 8, RN. The sensor may
also be removed and the two outside terminals
may be checked. Use the table to the left to
calculate the correct resistance reading.
Thermistor