PAGE 6
TECH SHEET - DO NOT DISCARD
PART NO. W10112987A
FOR SERVICE TECHNICIAN’S USE ONLY
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.
PROBLEM
POSSIBLE CAUSE / TEST
DRYER WILL NOT
RUN.
Refer to Motor Strip Circuit, page 3.
–
SUPPLY CONNECTIONS
–
HARNESS/CONNECTION
–
MOTOR RELAY
–
PUSH TO START (PTS) SWITCH
–
THERMAL FUSE
–
MOTOR
–
DOOR SWITCH
–
ELECTRONIC CONTROL
For more details, see Troubleshooting section, page 7.
DRYER WILL NOT
HEAT.
Refer to Heater Strip Circuit, page 3.
–
SUPPLY CONNECTIONS
–
HARNESS/CONNECTION
–
HEATER RELAY
–
THERMAL CUT-OFF
–
THERMAL FUSE
–
HIGH LIMIT THERMOSTAT
–
HEATER
–
CENTRIFUGAL SWITCH
–
THERMISTOR
–
ELECTRONIC CONTROL
For more details, see Troubleshooting section, page 7.
DRYER HEATS
DURING AIR
FLUFF (NO HEAT)
CYCLE.
Refer to Heater Strip Circuit, page 3.
–
HARNESS/CONNECTION
–
HEATER RELAY
–
TEMPERATURE SWITCH
–
ELECTRONIC CONTROL
For more details, see Troubleshooting section, page 7.
PROBLEM
POSSIBLE CAUSE / TEST
DRYER WON’T
SHUT OFF.
Refer to Motor and Moisture Sensor Strip Circuits,
page 3.
–
PUSH TO START (PTS) SWITCH
–
HARNESS/CONNECTION
–
MOTOR RELAY
–
MOISTURE SENSOR
–
ELECTRONIC CONTROL
For more details, see Troubleshooting section, page 7.
DRYER SHUTS
OFF BEFORE
CLOTHES
ARE DRY.
Refer to Thermistor Test, this page; and Moisture
Sensor Strip Circuit, page 3.
–
HARNESS/CONNECTION
–
MOISTURE SENSOR
–
THERMISTOR
–
ELECTRONIC CONTROL
–
MAY NEED TO CHANGE TIMER SETTING TO A MORE DRY
SETTING
For more details, see Troubleshooting section, page 8.
TIMER
CONTINUOUSLY
ADVANCES.
Refer to Timer Drawing, page 2; and Motor Strip
Circuit, page 3.
–
HARNESS/CONNECTION
–
TIMER
For more details, see Troubleshooting section, page 8.
WRINKLE
PREVENT DOES
NOT RUN.
Refer to Wrinkle Prevent Switch (On/Off) Test, page 5.
■
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
HEAT TURNS
OFF*
°F (°C)
HEAT TURNS
ON
°F (°C)
High
155°
±
10°
(68°
±
6°)
10°–15° (6°–8°)
below the
heat turn off
temperature
Normal
145°
±
10°
(63°
±
6°)
Medium, Casual
Medium,
Energy Saver
135°
±
10°
(57°
±
6°)
Low
125°
±
10°
(52°
±
6°)
Ex-Low
115°
±
10°
(46°
±
6°)
*
The measured overshoot using the glass
bulb thermometer in the exhaust outlet
can be 30°F (17°C) higher.
➔
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.
°F (°C)
RES.
k
Ω
TEMP.
°F (°C)
RES.
k
Ω
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
thermistor.
➔
If the thermistor resistance checks
agree with the measurements in the
table, replace the electronic control
assembly.
TROUBLESHOOTING GUIDE
IMPORTANT:
Electrostatic (static electricity) discharge may cause damage to
electronic control assemblies. See page 1 for details.
