Tip & How-To about Whirlpool LER4634J Electric Dryer
TEST #5 Moisture Sensor
NOTE: This test is started with the machine
completely assembled.This test is performed when an automatic cycle
stops too soon, or runs much longer than
expected.
NOTE: Dryer will shut down automatically after
2-1/2 hours.
The following items are part of this system:
Harness/connection,
Metal sensor strips,
Machine control electronics
1. Activate the diagnostic test mode and
advance past saved fault codes.
2. Open the dryer door. If a continuous beep
tone is heard and an alphanumeric number
is displayed on the console as soon
as the door is opened, a short circuit exists
in the moisture sensor system.
If this doesn’t happen, go to step 3.
Otherwise, go to step 4.
NOTE: Over drying may be caused by a
short circuit in the sensor system.
3. Locate the two metal sensor strips on the
inside of the dryer. Bridge these strips
with a wet cloth or finger.
If a continuous beep tone is heard and
a software revision number is displayed
on the console, the sensor passes the
test. Go to step 8.
If not, continue with step 4.
4. Access the moisture sensor wires:
Remove the lint screen.
Remove the two wires holding the lint
screen to the top.
Remove the four screws from bottom
of the duct in rear.
Remove the duct from the dryer to access
the moisture sensor.Disconnect the sensor connector.
5. Access the machine control electronics. Remove the connector P13
from the circuit board. Check the main
harness connections between the sensor
connector and machine control for a short
or open circuit.
Replace the main harness if necessary.
If the harness is okay, continue with
step 6.
6. Measure the resistance across the outermost
contacts of the sensor connector
that includes the two MOVs.
Sensor Harness
with MOVs
(Metal Oxide
Varistors)
Sensor
Connector
Sensor
Blower
Housing
Disconnect sensor connector.
If a small resistance is measured, check
for debris across moisture strips inside
of the drum; clean if debris is present.
If debris is not present, replace sensor
harness with MOVs.
Otherwise go to step 7.
7. Measure the resistance across each of
the outermost contacts and the center
terminal (ground connection).
If a resistance less than infinity is measured,
replace the sensor harness with
MOVs.
8. If moisture sensor diagnostic test passes,
check the thermistor: Perform TEST #4a.
If the problem persists after replacing
the moisture sensor, harness with
MOVs and thermistor, replace the machine
control electronics.
TEST #6 Buttons and Indicators
This test is performed when any of the following
situations occurs during the Console Buttons
and Indicators Diagnostic Test:
None of the indicators light up
No beep sound is heard
Some buttons do not light indicators
None of the indicators light up:
1. See Diagnostic Guide/Before Servicing.
2. Perform TEST #1 to verify supply connections.
3. Perform TEST #2.
4. Visually
check that the P5 connector is inserted
all the way into the machine control electronics.
5. Visually check the user interface assembly
connections.
6. If both visual checks pass, replace the
user interface assembly.
7. Plug in dryer or reconnect power.
8. Perform the Console Buttons and Indicators
Diagnostic test to verify repair.
9. 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.
No beep sound is heard:
1. Visually
check that the P5 connector is inserted
all the way into the machine control electronics.
If visual check passes, replace the user
interface assembly.
2. Plug in dryer or reconnect power.
3. Perform the Console Buttons and Indicators
Diagnostic test to verify repair.
4. If replacing the user interface assembly
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.
Some buttons do not light indicators:
1. Visually
check the user interface assembly connections.
If visual check passes, replace the user
interface assembly.
2. Plug in dryer or reconnect power.
3. Perform the Console Buttons and Indicators
Diagnostics test to verify repair.
TEST #7 Door Switch
Activate the diagnostic test mode and perform
the Door Switch Diagnostic test.
Functionality is verified with a beep each time
the door is closed and opened, and a number
and letter appears in the display (i.e., 0E,
09).
If any of the above conditions are not met:
Unplug dryer or disconnect power.
Check that the wires between the door
switch and machine control electronics
are connected. If the connections are OK, replace the
door switch assembly and retest.
If the door switch assembly has been replaced
and dryer still does not start, replace
the machine control electronics.
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