FOR SERVICE TECHNICIAN ONLY - DO NOT REMOVE OR DESTROY
PAGE 18
TEST #4d Gas Valve, Gas Dryer
1.
Unplug dryer or disconnect power.
2.
Access the gas valve by removing the
toe panel.
3.
Use an ohmmeter to determine if a gas valve
coil has failed. Remove harness plugs. Measure
resistance across terminals. Readings should
match those shown in the following chart. If not,
replace coil.
Terminals
Resistance (Ω)
1 to 2
1365 ± 60
1 to 3
560 ± 25
4 to 5
1325 ± 55
IMPORTANT:
Be sure all harness wires are
looped back through the strain relief after
checking or replacing coils.
TEST #5 Moisture Sensor
NOTE:
This test is started with the dryer
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.
1.
Activate the Diagnostic Test Mode and
advance past saved fault codes. See procedure
on page 2.
2.
Open the dryer door. The dryer will beep and
an alphanumeric number will be displayed.
3.
Locate the two metal sensor strips on the
face of the lint screen housing. Using a wet cloth
or one finger, jointly touch both strips.
If a beep tone is heard and an alphanumeric
number is displayed on the console, the sensor
passes the test. Go to step 8.
If a beep tone is not heard, or a continuous
beep tone is heard before touching both moisture
strips, continue with step 4.
NOTE:
Overdrying may be caused by a short
circuit in the sensor system.
4.
Access the machine control electronics. See
Accessing & Removing the Electronic Assemblies,
page 21. Remove connector P13 from the circuit
board. Check the main harness connections
between the sensor harness and machine control
for a short or open circuit.
Replace the main harness, if necessary.
If harness is OK, continue with step 5.
5.
Access the moisture sensor by removing the
toe panel. Disconnect the sensor from the wire
harness. See figure 11.
6.
Measure the resistance
across the outermost
contacts of the cable that
includes the two red MOVs.
If a small resistance is measured, check for
debris across moisture strips inside the drum;
clean if debris is present. If debris is not present,
replace sensor harness.
If a small resistance is not measured, continue
with step 7.
FRONT
Drum
Harness
Connection
MOVs
(Metal Oxide
Varistors)
Blower
Housing
Figure 11.
Disconnect sensor from wire
harness.