Test #9: Wash Temperature Sensor - Whirlpool WFC8090GX Service Manual

6. Remove connector J15 from the ACU.
With an ohmmeter, measure the resistance
across pins 5 and 6.
7. Resistance should be 20–30 Ω
when the pump is at room temperature.
8. Remove the rear panel to access drain
pump. Verify that pump, pump filter, drain
hose, and air trap are free from obstructions.
9. Visually check the electrical connections
Electrical Shock Hazard
at the drain pump.
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or
electrical shock.
10. With an ohmmeter, check harness for
continuity between the drain pump and ACU.

TEST #9: Wash Temperature Sensor

This test checks the temperature sensor, wiring, and ACU. This
test checks the temperature sensor, wiring, and ACU.
11. With an ohmmeter, measure the resistance
1. Unplug washer/dryer or disconnect power.
across the two pump terminals. Resistance
2. Gently lay washer/dryer on its right side to access the
should be 20–30 Ω.
ACU. Remove AC shield and ACU cover.
3. Disconnect connector J14 from the ACU.
4. Using an ohmmeter, measure the resistance across pins 5
and 6 of temperature sensor connector J14.
THERMISTOR SENSOR RESISTANCE
Approx. Temperature
F°
-4
14
32
59
77
86
104
122
WASH TEMPERATURE SENSOR
WASH TEMPERATURE SENSOR
Figure 7 - Drain Pump Assembly
DO NOT REMOVE OR
If connector is not inserted properly,
reconnect J15 and repeat step 2.
For Service Technician Use Only
WARNING
If the reading is infinite (open), go to step 8.
If the reading is correct, go to step 12.
If visual check passes, go to step 10.
If connections are loose, reconnect the
electrical connections and repeat step 2.
If there is continuity, go to step 11.
If there is no continuity, replace the lower
machine harness and repeat step 2.
If the reading is infinite (open), replace the
drain pump assembly.
If the reading is correct, go to step 12.
Approx. Resistance
C°
-20 197.3
-10 111.6
0
15
25
30
40
50
ACU
DESTROY
J14-6
+5 VDC
Figure 2 - Wash Temperature Sensor Strip Circuit
¾ If the resistance is infinite or close to zero, go to step 5.
¾ If it is within range, go to step 8.
5. Remove the rear panel to access the wash heating
element.
6. Disconnect the wash temperature sensor connector from
the heating element. See Figure 1.
7. Using an ohmmeter, measure the resistance across pins
1 and 2 of the wash temperature sensor (on the heating
element).
¾ If the resistance is within the specified range, the
¾ If the resistance is far out of range or open, replace the
8. If the preceding steps did not correct the temperature
sensor problem, replace the ACU.
¾ Unplug washer/dryer or disconnect power.
¾ Replace the ACU.
¾ Reassemble all parts and panels.
¾ Perform the Service Diagnostic Mode Tests on page 2-3
(KW)
65.5
31.5
20.0
Drain pump
16.1
connector
10.6
7.1
77°F (25°C) = 20.0 k ohms
T
WASH TEMPERATURE SENSOR
Whirlpool Smart All-In-One Washer & Dryer
Perform the Service Test Cycle
on page 5 to verify repair.
Water Temperature Controls
 Heating Element – Test #8
 Temperature Sensor – Test #9
THERMISTOR SENSOR RESISTANCE
TEST #8: Heating Element
Approx. Temperature
140 60
This test checks the heating element, wiring,
and ACU.
158 70
1. Unplug washer or disconnect power. 176 80
194 90
2. Gently lay washer on its right side
to access the ACU.
212 100
3. Disconnect connector J41 from the ACU. 248 120
302 150
4. Using an ohmmeter, measure the resistance
across pins 1 and 2 of connector J41.
If the resistance is 7-30 Ω, the heating
element and wiring are good; go to step 8.
If the resistance is open, go to step 5.
5. Remove back panel to access the heating
element.
6. Disconnect the wire connectors from the
heating element. See Figure 8.
sensor is good; replace the main harness.
7. Using an ohmmeter, measure the resistance
temperature sensor.
across the two heating element terminals.
If the resistance is 7-30 Ω, the heating
element is good; replace the lower main
harness.
If the resistance is open, replace the
heating element.
to verify repair.
Temperature Sensor
Heater Terminal
Figure 1 - Temperature Sensor
Figure 8 - Heater/Temperature Sensor Assembly
J14-5
WASH NTC
COMPONENT TESTING
Approx. Resistance
4.9
3.4
2.4
1.8
1.3
0.7
0.3
Assembly Removal Nut
Heater Terminal
ACU
n
3-13