Specifications

6-11
Heat will not shut off:
1. Unplug dryer or disconnect power.
2. Access the machine control electronics,
and measure the resistance between P14-3
(red-white wire) and P14-6 (red-white wire).
See Accessing & Removing the Electronic
Assemblies.
If 5–15 k ohms are measured, replace •
the machine control electronics.
If the resistance is greater than 20 k• Ω,
replace the thermistor.
TEST #3a Thermistor Test
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ashes
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 machine •
control electronics and thermistor. See
Accessing & Removing the Electronic
Assemblies, and for thermistor location
see Figure 11.
If wire connections are good, remove •
the two wires from the thermistor and
replace the thermistor. See Figure 11.
Replace all parts and panels before •
operating.
Plug in dryer or reconnect power.•
4. If F-22 or F-23doesnotashinthedisplay,
the connections to the thermistor are good.
Therefore, check the thermistor’s resistance
value at any or all of the temperature levels
in question, using the Timed Dry cycle, and
the following process:
* 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
speciedlimits,unplugdryerordisconnect
power.
6. Check the resistance of the thermistor.
NOTE: All thermistor resistance measurements
must be made while dryer is disconnected
from power.
The table below gives the resistance values
that should be observed for the various
temperature settings.
EXHAUST TEMPERATURES
TEMPERATURE
SETTING
HEAT TURNS
OFF*
HEAT TURNS
ON
High
155°± 5°F
(68°± 3°C)
10–15°F
(6–8°C)
belowthe
heat turn off
temperature
Medium
140°± 5°F
(60°± 3°C)
Low
125°± 5°F
(52°± 3°C)
Extra Low
115°± 5°F
(46°± 3°C)
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 correct
exhaust temperatures are as follows:
TEMP.
SETTING
TEMPERATURE
Thermistor resistance
valueat heater
shutoff (digitalor
analog meter)k
High
155°± 5°F
(68° ± 3°C)
2.1 1.7
Medium
140°± 5°F
(60° ± 3°C)
2.8 2.3
Low
125°± 5°F
(52° ± 3°C)
3.8 3.1
Extra
Low
115°± 5°F
(46° ± 3°C)
4.7 3.8
If needed, the following table gives tempera-
tures and their associated resistance values.
THERMISTOR RESISTANCE
TEMP.
°F (°C)
RES.
k Ω
TEMP.
°F (°C)
RES.
k Ω
50° (10°) 19.980° (27°) 9.2
60° (16°) 15.390° (32°) 7.4
70° (21°)11.9 100° (38°) 5.7