– 50 –
The control uses a water temperature sensor
(thermistor) to regulate the wash water
temperature.
To determine the temperature of the incoming
water, the washer control measures the difference
between the voltage sent and the voltage
returned from the water temperature sensor.
The washer control then makes temperature
adjustments by activating the appropriate water
valve.
The thermistor has a negative temperature
coefficient (as temperature increases, resistance
decreases).
Resistance can be measured at the thermistor
wire harness. Make sure to disconnect the wire
harness to isolate the thermistor before taking
resistance readings.
Thermistor
Temp
Approx. Ω
(ohms)
°C
°F
-10°
14°
57.4417
-5°
23°
44.9731
0°
32°
35.4632
5°
41°
28.1563
10°
50°
22.502
15°
59°
18.0968
20°
68°
14.6421
25°
77°
11.9159
30°
86°
9.7435
35°
95°
8.0112
40°
104°
6.6216
45°
113°
5.5006
50°
122°
4.5914
55°
131°
3.8502
60°
140°
3.243
65°
149°
2.7431
70°
158°
2.3298
75°
167°
1.9865
80°
176°
1.7002
85°
185°
1.4604
90°
194°
1.2589
95°
203°
1.0888
100°
212°
0.9447
Temperature Setting
Water Temperature
Tap Cold
Tap Cold
Cold
60°F +/- 5°F
Warm
90°F +/- 5°F
Hot
110°F +/- 5°F
Extra Hot
Sanitize/Tub Clean
160°F +/- 5°F
Turns on Heater
Operation of the thermistor can be checked by
using Service Test Mode t08 (see the
Service
Mode Test
in the
Diagnostics and Service
Information
section of this guide).
Specific failures associated with the thermistor
can initiate Fault Code F3 (see
Fault Codes
section in this service guide).
The thermistor is part of the heater assembly.
If the thermistor is bad, replace the heater
assembly.