Exhaust Thermistor - Whirlpool Duet Sport WED8300SW Manual

Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.

EXHAUST THERMISTOR

Blower Housing
Refer to page 4-9 for the procedure for ac-
cessing the exhaust thermistor.
The machine control electronics monitors the
exhaust temperature using the thermistor, and
cycles the heater relay on and off to maintain
the desired temperature.
Begin with an empty dryer and a clean lint
screen.
1. Plug in dryer or reconnect power.
2. Start the Timed Dry cycle.
3. If after 60 seconds, F-22 or F-23 flashes
in the display and the dryer shuts off, the
thermistor or wire harness is either open
or shorted.
• Unplug dryer or disconnect power.
• Check wire connections at the ma-
chine control electronics and thermis-
tor.
• If wire connections are good, remove
the two wires from the thermistor and
replace the thermistor.
• Plug in dryer or reconnect power.
Electrical Shock Hazard
Exhaust Thermistor
4. If F-22 or F-23 does not flash in the dis-
play, the connections to the thermistor
are good. Therefore, check the thermis-
tor's resistance value at any or all of the
temperature levels in question, using the
Timed Dry cycle, and the following pro-
cess:
Hold a glass bulb thermometer capable of
reading from 90° to 180°F (32° to 82°C) in
the center of the exhaust outlet. The cor-
rect exhaust temperatures are as follows:
EXHAUST TEMPERATURES
TEMPERATURE
SETTING
High
Medium
Low
Extra Low
* The measured overshoot using the glass
bulb thermometer in the exhaust outlet can
be 30°F (17°C) higher.
5. If the exhaust temperature is not within
specified limits, check the resistance of
the thermistor.
NOTE: All thermistor resistance measurements
(shown below) must be made while dryer is dis-
connected from power.
TEMP.
SETTING TEMPERATURE
155° ± 5°F
High
140° ± 5°F
Medium
125° ± 5°F
Low
Extra
115° ± 5°F
Low
5-4
HEAT TURNS HEAT TURNS
OFF* ON
155° ± 5°F
(68° ± 3°C)
10–15°F
140° ± 5°F
(6–8°C)
(60° ± 3°C)
below the
125° ± 5°F
heat turn off
(52° ± 3°C)
temperature
115° ± 5°F
(46° ± 3°C)
Thermistor resistance
value at heater
shutoff (digital or
analog meter) k Ω
2.1 1.7
(68° ± 3°C)
2.8 2.3
(60° ± 3°C)
3.8 3.1
(52° ± 3°C)
4.7 3.8
(46° ± 3°C)