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TECH SHEET - DO NOT DISCARD
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 2½ 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. See
procedure on page 1.
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 back panel. See
Removing the Back Panel, page 11.
Remove the lint screen.
Remove the two screws holding the
lint screen duct to the top.
Remove four screws from bottom of
the duct in rear. See figure 10,
page 7.
Remove the duct from the dryer to
access the moisture sensor.
Disconnect the sensor connector.
See figure 11.
FOR SERVICE TECHNICIAN'S USE ONLY
Sensor Harness
with MOVs
(Metal Oxide
Varistors)
Sensor
Blower
Housing
Figure 11. Disconnect sensor
connector.
5. Access the machine control
electronics. See Accessing &
Removing the Electronic Assemblies,
page 11. 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 harness is OK, continue with step
6.
6. Measure the resistance
across the outermost
contacts of the sensor
connector that includes the two MOVs.
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, page 8.
If the problem persists after
replacing the moisture sensor,
harness with MOVs and thermistor,
replace the machine control
electronics.
TEST #6 Buttons and
Indicators
Sensor
Connector
This test is performed when any of the
following situations occurs during the
Console Buttons and Indicators Diagnostic
Test, page 1:
None of the indicators light up
No beep sound is heard
Some buttons do not light indica-
tors
None of the indicators light up:
1. See Diagnostic Guide/Before
Servicing... on page 1.
2. Perform TEST #1, page 6 to verify
supply connections.
3. Perform TEST #2, page 6.
4. Perform steps in Accessing &
Removing the Electronic Assemblies,
page 11 and 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, page 1 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, page 1 to
verify repair.
No beep sound is heard:
1. Perform steps in Accessing &
Removing the Electronic Assemblies,
page 11 and 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, page 1 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.
PAGE 9
PART NO. W10054160