Whirlpool WET4027HW0, Service Manual

Page: 40 / 82

3-10
n
27” Stacked Laundry Center
TESTING – WASHER
For Service Technician Use Only
TEST #3b: Drive System - Motor
This test checks the motor, motor windings, wiring, and start
capacitor.
NOTE : Refer to Figure 3, “PSC Motor Strip Circuit” on page
3-11 for tests and measurements.
IMPORTANT : Drain water from tub before accessing bottom of
washer.
1. Check the motor and electrical connections by the Gentle
or Heavy Agitation test under Manual Test Mode on
page 9. Verify that the basket is spinning in a clockwise
direction while performing Low or High Spin test under
Manual Test Mode on page 2-11. The following steps
assume that this step was unsuccessful.
2. Unplug washer/dryer or disconnect power.
3. Check to see if basket will turn freely.
¾
If basket turns freely, go to step 4.
¾
If basket does not turn freely, determine what is
causing the mechanical friction or lockup.
4. Remove console to access main control.
5. Visually check that the J12 and J2 connectors are inserted
all the way into the main control.
¾
If visual checks pass, go to step 6.
¾
If connectors are not inserted properly, reconnect J12
and J2 and repeat step 1.
6. Plug in washer/dryer or reconnect power. Run the Gentle
Agitation test under Manual Test Mode on page 2-11.
7. With a voltmeter set to AC , connect black probe to J2-4
(L1) and red probe to J2-6 (CW Winding).
¾
If 120 VAC is cycling ON during CW rotation, go to step 8.
¾
If 120 VAC is not present, go to Test #1: Main Control,
page 3-5.
8. With a voltmeter set to AC , connect black probe to J2-4
(L1), red probe to J2-5 (CCW Winding).
¾
If 120 VAC is cycling ON during CCW rotation, go to step 9.
¾
If 120 VAC is not present, go to Test #1: Main Control,
page 3-5.
9. Unplug washer/dryer or disconnect power.
10. Remove connector J2 from main control. With an
ohmmeter, check resistance of motor windings across the
following J2 connector pinouts:
NOTE : If the console has a cycle selector knob and 4
rotary switches, the motor size is 1/3 HP.
Size Motor Winding J2 Pinout Resistance
1/4 HP CW Winding J2, 4 & 6
Lower harness
connector, 8 & 9
5 to 9.5
CCW Winding J2, 4 & 5
Lower harness
connector, 8 & 10
5 to 9.5
1/3 HP CW Winding J2, 4 & 6
Lower harness
connector, 8 & 9
3.5 to 6
CCW Winding J2, 4 & 5
Lower harness
connector, 8 & 10
3.5 to 6
¾
If values are open or out of range, go to step 11.
¾
If values are correct, go to step 15.
11. Tilt washer/dryer back to access drive system.
12. Visually check the mounting bracket and electrical
connections to the motor and shifter. Verify that the wires
between the motor and the harness are connected this
way: Black-white/White, Orange/Yellow, and Red/Red.
¾
If visual check passes, go to step 13.
¾
If connections are loose, reconnect the electrical
connections, reassemble motor cover, and repeat step 1.
13. With an ohmmeter, check the harness for continuity
between the main control, motor, and run capacitor using
the following test points.
Motor Harness Check
Motor connector Pin 1 to chassis ground
Motor connector Pin 3 to lower harness connector Pin 10 to main control J2-5
Motor connector Pin 3 to run capacitor Pin 3
Motor connector Pin 4 to lower harness connector Pin 9 to main control J2-6
Motor connector Pin 4 to run capacitor Pin 1
Motor connector Pin 2 to lower harness connector Pin 8 to main control J2-4
¾
If there is continuity, go to step 14.
¾
If there is no continuity, replace the lower or upper
washer harness (depending on where the issue was)
and repeat step 1.
DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.