Whirlpool WFC8090GX, Service Manual, Page: 43 / 82

COMPONENT TESTING
Whirlpool Smart All-In-One Washer & Dryer
n
3-13
For Service Technician Use Only
TEST #9: Wash Temperature Sensor
This test checks the temperature sensor, wiring, and ACU. This
test checks the temperature sensor, wiring, and ACU.
1. Unplug washer/dryer or disconnect power.
2. Gently lay washer/dryer on its right side to access the
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 Approx. Resistance
F° C° (K
W
)
-4 -20 197.3
14 -10 111.6
32 0 65.5
59 15 31.5
77 25 20.0
86 30 16.1
104 40 10.6
122 50 7.1
THERMISTOR SENSOR RESISTANCE
Approx. Temperature Approx. Resistance
140 60 4.9
158 70 3.4
176 80 2.4
194 90 1.8
212 100 1.3
248 120 0.7
302 150 0.3
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
sensor is good; replace the main harness.
¾
If the resistance is far out of range or open, replace the
temperature sensor.
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
to verify repair.
Figure 2 - Wash Temperature Sensor Strip Circuit
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Failure to do so can result in death or
electrical shock.
Replace all parts and panels before operating.
WASH TEMPERATURE SENSOR
Figure 1 - Temperature Sensor
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DES TROY
4. Gently lay washer on its right side
to access the ACU.
5. Visually check that the J15 connector
is inserted all the way into the ACU.
¾
If visual check passes, go to step 6.
¾
If connector is not inserted properly,
reconnect J15 and repeat step 2.
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.
¾
If the reading is infinite (open), go to step 8.
¾
If the reading is correct, go to step 12.
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
at the drain pump.
¾
If visual check passes, go to step 10.
¾
If connections are loose, reconnect the
electrical connections and repeat step 2.
10. With an ohmmeter, check harness for
continuity between the drain pump and ACU.
¾
If there is continuity, go to step 11.
¾
If there is no continuity, replace the lower
machine harness and repeat step 2.
11. With an ohmmeter, measure the resistance
across the two pump terminals. Resistance
should be 20–30 Ω .
¾
If the reading is infinite (open), replace the
drain pump assembly.
¾
If the reading is correct, go to step 12.
Figure 7 - Drain Pump Assembly
12. If the preceding steps did not correct the
drain problem, replace the ACU.
¾
Unplug washer or disconnect power.
¾
Replace the ACU.
¾
Reassemble all parts and panels.
¾
Perform the Service Test Cycle
on page 5 to verify repair.
Water Temperature Controls
✓
Heating Element – Test #8
✓
Temperature Sensor – Test #9
TEST #8: Heating Element
This test checks the heating element, wiring,
and ACU.
1. Unplug washer or disconnect power.
2. Gently lay washer on its right side
to access the ACU.
3. Disconnect connector J41 from the ACU.
4. Using an ohmmeter, measure the resistance
across pins 1 and 2 of connector J41.
¾
If the resistance is 7-30
Ω
, the heating
element and wiring are good; go to step 8.
¾
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.
7. Using an ohmmeter, measure the resistance
across the two heating element terminals.
¾
If the resistance is 7-30
Ω
, the heating
element is good; replace the lower main
harness.
¾
If the resistance is open, replace the
heating element.
Drain pump
connector
Temperature Sensor
Figure 8 - Heater/Temperature Sensor Assembly
Heater Terminal Heater Terminal
Assembly Removal Nut
ACU
WASH TEMPERATURE SENSOR
ACU
J14-5 J14-6
T
+5 VDC WASH NTC
WASH TEMPERATURE SENSOR
77°F (25°C) = 20.0 k ohms