Whirlpool MAT20CS Manual page 16

 If the capacitor is either shorted or open, replace capacitor,
run Calibration Mode (see page 4), and repeat step 1.
16. If the preceding steps did not correct the motor problem,
replace the main control.
a. Unplug washer or disconnect power.
b. Replace the main control.
c. Reassemble all parts and panels.
d. Plug in washer or reconnect power. Run Calibration Mode
(see page 4) and perform Quick Overview Test on page 8
to verify repair.
TEST #4: Console and Indicators
Console and Indicators Check:
This test is performed when any of the following situations
occurs during "UI (Rotary Switch) Test Mode" on page 4.
 N one of the LEDs light up
 O ne or more Status LEDs are flashing
 T urning rotary switch does not toggle an LED
None of the LEDs light up:
1. Unplug washer or disconnect power.
2. Access the main control and visually check that ALL
connectors are inserted all the way into their respective
headers.
3. Visually check that the main control assembly is properly
inserted in the console.
4. If both visual checks pass, follow procedure under TEST #1,
"Main Control" on page 12 to verify supply voltages.
5. To verify repair, activate the Service Diagnostic Mode, and
then perform UI (Rotary Switch) Test Mode on page 4.
One or more Status LEDs are flashing:
If one or more of the status LEDs are flashing (on and off in
0.5 second intervals), refer to the following notes to identify the
switch(es) in question. Reference the wiring diagram on page 20
when performing the following procedures.
a. Verify the switch connector is inserted all the way into the
main control.
b. Check the harness between the switch and main control
for continuity. Check for shorts.
c. Replace the switch.
d. Replace the main control.
NOTE 1: The number and location of rotary switches varies
between makes and models.
NOTE 2: Regardless of location, switches are read from left
to right (not counting the pressure switch), the left-most switch
being #1.
16
FOR SERVICE TECHNICIAN'S USE ONLY
NOTE 3: The temperature switch and the cycle selector knob
are represented by the following status LEDs:
• Jumper Board J3&J4 – toggles (1) In Use LED
• Jumper Board J2 – toggles (2) Soak/Wash LED
• Jumper Board J3 – toggles (3) Rinse LED
• Jumper Board Coin Slide Switch – toggles (4) Final Spin LED
• Cycle Select Knob – toggles (5) Done LED
NOTE 4: Status LED names may vary between makes and
models. Use LED # identification.
(1)In (2)Soak/
Use Wash
Turning rotary switch does not toggle an LED:
Perform the procedures under "One or more Status LEDs
are flashing."
TEST #5: Temperature Thermistor
This test checks valves, main control, temperature thermistor,
and wiring.
1. Check the cold valve by performing Cold Valve test under
Manual Overview Test Mode on page 9.
 If cold water is being dispensed, proceed to step 2.
 If hot water is being dispensed, verify proper hose
connection.
2. Check the hot valve by performing Hot Valve test
under Manual Overview Test Mode on page 9.
 If hot water is being dispensed, proceed to step 3.
 If cold water is being dispensed, ensure that household
hot water is present.
3. Unplug washer or disconnect power.
4. Remove console to access main control.
5. Remove connector J3 from the main control. With an
ohmmeter, measure the resistance of the temperature
thermistor between pins J3-9 and J3-10. Verify that the
approximate resistance, shown in the following table,
is within ambient temperature range.
(4)Final
(3)Rinse Spin (5)Done
DO NOT REMOVE OR DESTROY