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PAGE 6
Thermistor Test or Dryer Beeps
3 Times when Push to Start (PTS)
Pressed
An electronic temperature sensor called a
thermistor is used in this model in place of
an operating thermostat. The electronic
control monitors the exhaust temperature
using the thermistor, and cycles the heater
relay on and off to maintain the desired
temperature.
Procedure
Begin with a fully assembled, empty dryer
and a clean lint screen.
1. Set the following configuration:
Door - must be closed
Timer dial - Timed Drying
Temperature switch - High
Wrinkle Prevent switch - Off
End of Cycle Signal switch - Louder
2. Press the Push to Start switch.
If you hear three short beeps and the
dryer shuts off after several seconds,
the thermistor or wire harness is either
shorted or open.
Unplug dryer or disconnect power.
Check wire connections at the
electronic control and thermistor.
TROUBLESHOOTING GUIDE
PROBLEM
Refer to Motor Strip Circuit, page 3.
– SUPPLY CONNECTIONS
– HARNESS/CONNECTION
– MOTOR RELAY
– PUSH TO START (PTS) SWITCH
DRYER WILL NOT
RUN.
– THERMAL FUSE
– MOTOR
– DOOR SWITCH
– ELECTRONIC CONTROL
For more details, see Troubleshooting section, page 7.
Refer to Heater Strip Circuit, page 3.
– SUPPLY CONNECTIONS
– HARNESS/CONNECTION
– HEATER RELAY
– THERMAL CUT-OFF
DRYER WILL NOT
– THERMAL FUSE
HEAT.
– HIGH LIMIT THERMOSTAT
– HEATER
– CENTRIFUGAL SWITCH
– THERMISTOR
– ELECTRONIC CONTROL
For more details, see Troubleshooting section, page 7.
Refer to Heater Strip Circuit, page 3.
– HARNESS/CONNECTION
DRYER HEATS
DURING AIR
– HEATER RELAY
FLUFF (NO HEAT)
– TEMPERATURE SWITCH
CYCLE.
– ELECTRONIC CONTROL
For more details, see Troubleshooting section, page 7.
PART NO. W10114943A
If wiring is functional, replace the
thermistor. Refer to Thermal
Components illustration, page 5.
If the dryer appears to operate
correctly, proceed to step 3.
3. Remove exhaust vent and start the dryer.
Turn Temperature switch to desired
temperature to be tested, and select
20 minutes of Timed Drying. Hold a
glass bulb thermometer capable of
reading from 90°F to 180°F (32°C to
82°C) in the center of the exhaust
outlet. Measure exhaust temperatures
with heater off and on.
The correct exhaust temperatures
are as follows:
EXHAUST TEMPERATURES
TEMPERATURE
SWITCH
SETTING
High
Normal
Medium, Casual
Medium,
Energy Saver
Low
Ex-Low
*
The measured overshoot using the glass
bulb thermometer in the exhaust outlet
can be 30°F (17°C) higher.
IMPORTANT: Electrostatic (static electricity) discharge may cause damage to
electronic control assemblies. See page 1 for details.
POSSIBLE CAUSE / TEST
HEAT TURNS
HEAT TURNS
OFF*
ON
°F (°C)
°F (°C)
155° ± 10°
(68° ± 6°)
145° ± 10°
(63° ± 6°)
10°–15° (6°–8°)
135° ± 10°
below the
(57° ± 6°)
heat turn off
125° ± 10°
temperature
(52° ± 6°)
115° ± 10°
(46° ± 6°)
PROBLEM
Refer to Motor and Moisture Sensor Strip Circuits,
page 3.
– PUSH TO START (PTS) SWITCH
– HARNESS/CONNECTION
DRYER WON'T
SHUT OFF.
– MOTOR RELAY
– MOISTURE SENSOR
– ELECTRONIC CONTROL
For more details, see Troubleshooting section, page 7.
Refer to Thermistor Test, this page; and Moisture
Sensor Strip Circuit, page 3.
– HARNESS/CONNECTION
DRYER SHUTS
– MOISTURE SENSOR
OFF BEFORE
– THERMISTOR
CLOTHES
– ELECTRONIC CONTROL
ARE DRY.
– MAY NEED TO CHANGE TIMER SETTING TO A MORE DRY
SETTING
For more details, see Troubleshooting section, page 8.
Refer to Timer Drawing, page 2; and Motor Strip
Circuit, page 3.
TIMER
CONTINUOUSLY
– HARNESS/CONNECTION
ADVANCES.
– TIMER
For more details, see Troubleshooting section, page 8.
WRINKLE
PREVENT DOES
Refer to Wrinkle Prevent Switch (On/Off) Test, page 5.
NOT RUN.
FOR SERVICE TECHNICIAN'S USE ONLY
TECH SHEET - DO NOT DISCARD
If the exhaust temperature is not
within specified limits:
Unplug dryer or disconnect power.
Disconnect wires from thermistor,
then check the resistance of the
thermistor. The following table
gives temperatures and ranges for
their associated resistance values:
THERMISTOR RESISTANCE
TEMP.
RES.
TEMP.
°F (°C)
kΩ
°F (°C)
50° (10°)
19.0–22.0
80° (27°)
60° (16°)
14.8–16.8
90° (32°)
70° (21°)
11.5–13.5
100° (38°)
If the thermistor resistance does not
agree with table, replace the
thermistor.
If the thermistor resistance checks
agree with the measurements in the
table, replace the electronic control
assembly.
POSSIBLE CAUSE / TEST
RES.
kΩ
8.5–10.5
6.8–8.8
5.0–7.0
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Troubleshooting
