Maytag MDE25PN - Thermistor

5-9
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.

Check the thermistor resistance value
at any or all of the temperature levels in
question, using the Dry Cycle, and the
following process:
Hold a glass bulb thermometer capable of
reading from 32° to 82°C (90° to 180°F) in
the center of the exhaust outlet. The correct
exhaust temperatures are as follows:
EXHAUST TEMPERATURES
FABRIC
SETTING
HEAT TURNS
OFF*
HEAT TURNS
ON
Whites
And Colors
155° ± 5°F
(68° ± 3°C)
10-15°F
(6-8°C)
Below the
heat turn off
temperature
Perm.
Press
155° ± 5°F
(68° ± 3°C)
Delicates
140° ± 5°F
(60° ± 3°C)
* The measured overshoot using the glass
bulb thermometer in the exhaust outlet can
be 17 °C (30 °F) higher.
If the exhaust temperature is not within
specified limits, unplug dryer or disconnect
power.
Check the resistance of the thermistor.
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Thermistor resistance
measurements must be made while dryer is
disconnected from power and at least 1 lead
removed from the thermistor..
1.
2.
3.
The table below gives the resistance values
that should be observed for the various
temperature settings.
FABRIC
SETTING
TEMPERATURE
Thermistor
resistance value
at heater shutoff
(digital or analog
meter) kΩ
Whites
and
Colors
155° ± 5°F
(68° ± 3°C)
2.1 - 1.7
Perm.
Press
155° ± 5°F
(68° ± 3°C)
2.1 - 1.7
Delicates
140° ± 5°F
(60° ± 3°C)
2.8 - 2.3
If needed, the following table gives
temperatures and their associated
resistance values.
THERMISTOR RESISTANCE
TEMP.
°F (°C)
RES.
kΩ
TEMP.
°F (°C)
RES.
kΩ
50° (10°) 19.9 80° (27°) 9.2
60° (16°) 15.3 90° (32°) 7.4
70° (21°) 11.9 100° (38°) 5.7
• If the thermistor resistance checks within
normal limit, replace dryer CCU control.