Whirlpool W10301482B Tech Sheet page 7

TECH SHEET - DO NOT DISCARD
➔ Unplug dryer or disconnect power.
➔ Check wire connections at the machine control
electronics and inlet thermistor. See Accessing
& Removing the Electronics Assemblies,
page 9, and for inlet thermistor location, see
figure 9, page 6.
➔ If wire connections are good, remove the wires
from the inlet thermistor/high limit thermostat
assembly and replace the assembly.
➔ Replace all parts and panels.
➔ Plug in dryer or reconnect power.
3. If
F :24 F :25 or is not an error that is displayed
in the diagnostic test mode, the connections to
the thermistor are good. Therefore, check the
thermistor's resistance value, using the following
process:
➔ Unplug dryer or disconnect power.
➔ Access the heater assembly. See figure 2,
page 4; and Removing the Front Panel/Drum
Assembly, page 9.
➔ Hold a glass bulb thermometer capable of
reading from 68° to 176°F (20° to 80°C) in the
heater assembly.
➔ Check the resistance of the inlet thermistor.
See figure 9, page 6 for location.
INLET THERMISTOR RESISTANCE
TEMP. RES. TEMP.
°F (°C) kΩ °F (°C)
68° (20°) 61.2–63.7 131° (55°) 14.6–15.3
77° (25°) 49.0–51.0 140° (60°) 12.1–12.8
86° (30°) 39.5–41.1 149° (65°) 10.2–10.7
95° (35°) 32.0–33.3 158° (70°)
104° (40°) 26.1–27.2 167° (75°)
113° (45°) 21.4–22.3 176° (80°)
122° (50°) 17.6–18.5
The table above shows the resistance values that
should be observed for the various temperatures
at the heater assembly.
➔ If the thermistor resistance does not agree with
the measurements in the table, replace the inlet
thermistor/high limit thermostat assembly.
➔ If the thermistor resistance agrees with the
measurements in the table, replace the
machine control electronics.
TEST #4b Thermal Fuse
The thermal fuse is wired in series with the dryer
drive motor.
1. Unplug dryer or disconnect power.
2. Access the thermal fuse by first removing the
front panel. See Removing the Front Panel/Drum
Assembly, page 9; and for thermal fuse location,
see figure 9, page 6.
3. Using an ohmmeter, check the continuity across
the thermal fuse.
➔ If the ohmmeter indicates an open circuit,
replace the failed thermal fuse.
F O R S E R V I C E T E C H N I C
TEST #4c 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 front
panel and drum assembly. See Removing the Front
Panel/Drum Assembly, page 9.
3. Using an ohmmeter, check the continuity across
the thermal cut-off. See figure 9, page 6, for
location.
➔ If the ohmmeter indicates an open circuit,
replace the failed thermal cut-off and inlet
thermistor/high limit thermostat assembly.
In addition, check for blocked or improper
exhaust system, or failed heat element.
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 2½
hours.
The following items are part of this system:
– Harness/connection
– Metal sensor strips
RES.
– Machine control electronics. See ESD
kΩ
information, page 1.
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
8.5–9.0
on the console as soon as the door is opened, a
7.2–7.6
short circuit exists in the moisture sensor system.
6.1–6.5
➔ If this doesn't happen, go to step 3.
➔ Otherwise, go to step 4.
NOTE: Overdrying may be caused by a short
circuit in the sensor system.
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 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 a beep tone is not heard, or a continuous
beep tone is heard before touching both
moisture strips, continue with step 4.
4. Unplug dryer or disconnect power. Access the
moisture sensor wires by removing the front panel.
See Removing the Front Panel/Drum Assembly,
page 9. Disconnect the sensor connector. See
figure 10.
I A N S ' U S E O N L Y
Sensor
Lint Screen
Housing
Figure 10. Disconnect sensor connector.
5. Access the machine control electronics.
See Accessing & Removing the Electronic
Assemblies, page 9. 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 the sensor harness
with MOVs.
➔ If a small resistance is not measured, continue
with 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 6.
➔ If the problem persists after replacing the
moisture sensor harness with MOVs and the
thermistor, replace the machine control
electronics.
P A R T N O . W10301482B
PAGE 7
Sensor Harness
with MOVs
(Metal Oxide
Varistors)
Sensor
Connector