Maytag YMEDE250XL0 Mode D'emploi page 18

FOR SERVICE TECHNICIAN ONLY - DO NOT REMOVE OR DESTROY
The following table gives temperatures and their
associated resistance values.
EXHAUST THERMISTOR RESISTANCE
Res.
Temp Range
°F (°C) kΩ
50° (10°) 19.0–22.0 80° (27°) 8.5–10.5
60° (16°) 14.8–16.8 90° (32°) 6.8–8.8
70° (21°) 11.5–13.5 100° (38°) 5.0–7.0
If the thermistor resistance does not agree
with table, replace the exhaust thermistor.
If the thermistor resistance checks agree
with the measurements in the table, replace
the machine control electronics.
TEST #3b Thermal Fuse
ELECTRIC DRYER: The thermal fuse is wired
in series with the dryer drive motor.
GAS DRYER: The thermal fuse is wired in series
with the dryer gas valve.
ALL DRYERS:
1. Unplug dryer or disconnect power.
2. Access the thermal fuse by first removing
the toe panel. For thermal fuse location, see
figure 10, page 16.
3. Using an ohmmeter, check the continuity
across the thermal fuse. See figure 10 for location.
If the ohmmeter indicates an open circuit,
replace the failed thermal fuse.
TEST #3c Thermal Cut-Off
If the dryer does not produce heat, check the
status of the thermal cut-off.
1. Unplug dryer or disconnect power.
2. Access the thermal cut-off by first removing
the toe panel.
3. Using an ohmmeter, check the continuity
across the thermal cut-off. See figure 10, page
16, for location.
If the ohmmeter indicates an open circuit,
replace the failed thermal cut-off and high limit
thermostat. In addition, check for blocked or
improper exhaust system, or failed heat element
(electric dryer).
TEST #3d Gas Valve, Gas Dryer Only
1. Unplug dryer or disconnect power.
2. Access the gas valve by removing the
toe panel.
Res.
Temp Range
°F (°C) kΩ
PAGE 18
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
1 to 2
1 to 3
4 to 5
IMPORTANT: Be sure all harness wires are
looped back through the strain relief after
checking or replacing coils.
TEST #4 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.
The following items are part of this system:
Harness/connection
Metal sensor strips
Machine control electronics.
See ESD information, page 1.
1. Enter Service Diagnostic mode and select the
User Interface/Control System test. See procedure
on page 5.
2. Open the dryer door.The dryer should beep
and an alphanumeric number should be displayed
(on models with seven segment display) or the
TEMP indicators should change (on models without
seven segment display).
3. Locate the two metal sensor strips on the
face of the lint screen housing. Bridge these strips
with a wet cloth or finger.
If a beep tone is heard and an alphanumeric
number is displayed on the console (on models
with seven segment display) or the TEMP and
STATUS indicators change (on models without
seven segment display), the sensor passed
the test. Go to step 9.
If a beep tone is not heard, or a continuous
beep tone is heard before bridging the moisture
strips, continue with step 4.
NOTE: Overdrying may be caused by a short
circuit in the sensor system.
Resistance (Ω)
1365 ± 25
560 ± 25
1220 ± 50