Tip & How-To about Whirlpool LER4634J Electric Dryer
TEST #1 Supply Connections
This test should only be done after confirming
proper voltage at the outlet.
1. Unplug dryer or disconnect power.
2. Remove the cover plate from the back of
the dryer.
3. Check that the power cord is firmly connected
to the dryer’s wire harness.
4. Access the machine control electronics
without disconnecting any wiring to the
control board.
5. With an ohmmeter, check for continuity
between the neutral (N) terminal of the
plug and P8-3 (white wire) on the machine
control board.
If there is continuity, go to step 6.
If there is no continuity, disconnect
the white wire of the harness from the
power cord. Test the continuity of the
power cord neutral wire . If an open circuit is found,
replace the power cord. Otherwise, go
to step 6.
6. In a similar way, check the continuity between
the L1 terminal of the plug and P9-
2 (black wire) on the control board.
If there is continuity, go to step 8.
If there is no continuity, check the continuity
of the power cord
for power cord’s L1 wire.
If an open circuit is found, replace the
power cord. Otherwise, go to step 7.
7. Replace the main harness.
8. Visually check that the P5 connector is
inserted all the way into the machine
control electronics.
9. Visually check that the user interface assembly
is properly inserted into the front
console.
10. If both visual checks pass, replace the
user interface assembly.
11. Plug in dryer or reconnect power.
12. Perform the Console Buttons and Indicators
Diagnostic test to verify repair.
13. If indicators still do not light, the machine
control electronics has failed:
Unplug dryer or disconnect power.
Replace the machine control electronics.
Plug in dryer or reconnect power.
Perform the Console Buttons and Indicators
Diagnostic test to verify repair.
TEST #2 Machine Control Power Check
This test is used to determine if power is present
at the machine control electronics.
NOTE: The drum light is controlled by the machine
control on all models.
1. Plug in dryer or reconnect power.
2. Open the door.If the drum light illuminates, then power
is present at the machine control, and
it is functional. Go to TEST #6.
If the drum light fails to illuminate, do
not assume the machine control electronics
needs replacement. Several
conditions may cause the drum light
not to illuminate, including a bad bulb.
If the drum light does not illuminate, go
to TEST #1.
TEST #3 Drive Motor Circuit
This test will check the wiring to the motor and
the motor itself. The following items are part
of this motor system:
Harness/connection
Belt/belt switch
Drive motor
Centrifugal switch
Door switch
Machine control electronics
1. Unplug dryer or disconnect power.
2. Access the machine control electronics
and measure the resistance across
P8-4 and P9-1.
If resistance across P8-4 and P9-1 is
in the range of 1 to 6 ohms, replace the
machine control electronics.
Otherwise, go to step 3.
3. Check the wiring and components in the
path between these measurement points
by referring to the appropriate wiring diagram
and strip circuit in Section 7.
4. Check the belt switch and drive motor.
Access the belt switch and drive motor
by removing the front panel/drum assembly.
Slowly remove the drum belt
from the spring-loaded belt switch tension
pulley, gently letting the belt pulley
down.
5. Remove the white connector from the
drive motor switch.
6. Check for the resistance
values of the motor’s Main and Start
winding coils.
NOTE: Main and Start winding coils must
be checked at the motor.WINDING RESISTANCE ω
CONTACT POINTS
OF MEASUREMENT
MAIN 1.4–2.6
Blue wire in back at
pin 4 and bare copper
wire on pin 5 of black
drive motor switch
START 1.4–2.8
Blue wire in back at
pin 4 and bare copper
wire on pin 3 of black
drive motor switch. If the resistance at the motor is correct,
there is an open circuit between the
motor and machine control electronics.
Check for failed belt switch.
If the Start winding resistance is much
greater than 4 ohms, replace the motor.
7. Check the belt switch by measuring resistance
between the two blue wires while pushing up the
belt switch tension pulley.If the resistance reading goes from infinity
to a few ohms as pulley arm closes
the switch, belt switch is OK. If not,
replace the belt switch.
If belt switch is OK and there is still an
open circuit, check and repair the wiring
harness.
8. Door switch problems can be uncovered
in the Door Switch Diagnostic Test; however,
if this was not done, the following
can be done without applying power to
the dryer. Connect an ohmmeter across
P8-3 (neutral, white wire) and P8-4 (door,
tan wire).With the door properly closed, the ohmmeter
should indicate a closed circuit
(0–2 ohms).
If not, replace the door switch assembly.
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