Whirlpool CATALYST Manual de reparación y solución de problemas - Página 36
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Test #6 - Automatic Temperature Control (ATC) Test
This test checks the water inlet relays, the temperature sensor, and the control
board.
A: Test the fill valves
1.
Check that the hot and cold water valves are working. Use the procedure in Test #2.
Note: This test MUST be done with the Automatic Temperature Control off.
2.
If working properly, go to B.
B: Test the temperature sensor
1.
Turn on the Automatic Temperature
Control feature.
2.
Set the water level setting to the "Low"
setting. Use the WASH/RINSE TEMP
selector button and set the Wash water
temperature to "Warm".
3.
Press the "Regular" or "Heavy Duty" cycle.
4.
Press "Start". After the tub fills, press the
"Stop/Pause" button. Measure the temper-
ature of the water. For the Warm setting,
the temperature range should be 90 - 110
degrees F which indicates proper operation.
5.
If the temperature is not in this range,
check the Automatic Temperature Control
sensor as follows:
• Remove connector P5 from the microcomputer board.
• Measure the resistance between P5-5 and P5-4 in the connector. The resistance should be
between 74 kΩ and 24 kΩ. If not, check for continuity between the connector and the sensor.
If continuity is good, replace the temperature sensor/inlet valve assembly.
C: If system passes Steps A & B - Replace the control board.
THERMISTOR RESISTANCE CHART
Temperature
Degrees (F)
40
50
60
70
80
90
100
110
120
130
140
150
32
Resistance
(Ohms)
126k - 135k
97k - 102k
75k - 78k
58k - 61k
46k - 47k
36k - 37k
28k - 30k
23k - 24k
18k - 19k
15k - 16k
12k - 13k
10k - 11k