Test #2: Motor Circuit - Whirlpool WETLV27HW0 Service Manual

27 inch gas & electric stacked laundry center
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WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or
electrical shock.

TEST #2: Motor Circuit

This test will check the wiring to the motor and the motor
itself.
1. Unplug dryer or disconnect power.
2. Check for loose, worn, or damaged drum belt—repair as
necessary.
3. Door Switch problems can be uncovered by following
procedure under TEST #5: Door Switch, page 4-14.
4. Check the wiring and components in the motor circuit by
referring to the appropriate wiring diagram on pages 4-4
to 4-7 or the Motor Strip Circuit below (see Figure 1).
Check the thermal fuse. See TEST #3a: Thermal Fuse, page
4-11.
Continue with step 5 to test the remaining components in
the motor circuit.
5. Check the drive motor and belt switch. Slowly remove the
drum belt.
6. Remove the white connector from the drive motor switch.
7. Remove the bare copper wire terminal from pin 5 of black
drive motor switch.
8. Using the appropriate wiring diagram on pages 4-4 to 4-7,
check for the resistance values of the motor's Main and
Start winding coils as shown in the following table.
MOTOR STRIP CIRCUIT
MOTOR CIRCUIT
L1
TIMER
BK
LBU
C
B
For Service Technician Use Only
BELT
THERMAL
SWITCH
FUSE
LBU
4M
Figure 1 - Motor Strip Circuit
NOTE: Main and Start winding coils must be checked at
the motor.
Resistance
Winding
in ohms
MAIN
2.4 - 3.6
START
2.4 - 3.8
¾ If the resistance at the motor is correct, there is an
open circuit between the motor and the timer. Check
for a belt switch problem (see step 9) and check and
repair the main wiring harness.
¾ If the Main or Start winding resistance is much greater
or less than the values listed in the table above, replace
the motor.
9. Check the belt switch by measuring resistance between
the two light blue wires in the belt switch connector block
while pushing up the belt switch pulley.
¾ If the resistance reading goes from open to a few ohms
as pulley arm closes the switch, belt switch is good. If
not, replace the belt switch.
¾ If belt switch is good and there is still an open circuit,
check and repair the main wiring harness.
10. Reassemble all parts and panels.
11. Plug in dryer or reconnect power.
Pluggable Drive Motor Switch
Black
DRIVE MOTOR
W
MAIN
5M
2.4-3.6 Ω
2.4-3.8 Ω
3M
START
CENTRIFUGAL SWITCH
TESTING – DRYER
Contact Points of Measurements
Lt Blue wire in back at pin 4
and bare copper wire terminal
removed from pin 5 of black drive
motor switch
Lt Blue wire in back at pin 4 and
bare copper wire terminal on pin
3 of black drive motor switch
START
NO
COM
W
2M
LBU
BK
DOOR SWITCH
6M
1M
27" Stacked Laundry Center
Figure 2
N
W
4-9
n

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