Thermistor - Maytag MDG25PN Service Manual

Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
1. 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 HEAT TURNS
SETTING
Whites 155° ± 5°F
And Colors (68° ± 3°C)
Perm. 155° ± 5°F
Press (68° ± 3°C)
140° ± 5°F
Delicates
(60° ± 3°C)
* The measured overshoot using the glass
bulb thermometer in the exhaust outlet can
be 17 °C (30 °F) higher.
2. If the exhaust temperature is not within
specified limits, unplug dryer or disconnect
power.
3. Check the resistance of the thermistor.
nOTE: Thermistor resistance
measurements must be made while dryer is
disconnected from power and at least 1 lead
removed from the thermistor..

THErMiSTOr

HEAT TURNS
OFF* ON
10-15°F
(6-8°C)
Below the
heat turn off
temperature
Electrical Shock Hazard
The table below gives the resistance values
that should be observed for the various
temperature settings.
FABRIC
SETTING
Whites
and
Colors
Perm.
Press
Delicates
If needed, the following table gives
temperatures and their associated
resistance values.
THERMISTOR RESISTANCE
TEMP.
°F (°C)
50° (10°)
60° (16°)
70° (21°)
• If the thermistor resistance checks within
normal limit, replace dryer CCU control.
5-9
Thermistor
resistance value
TEMPERATURE at heater shutoff
(digital or analog
meter) kΩ
155° ± 5°F
2.1 - 1.7
(68° ± 3°C)
155° ± 5°F
2.1 - 1.7
(68° ± 3°C)
140° ± 5°F
2.8 - 2.3
(60° ± 3°C)
RES. TEMP.
kΩ °F (°C)
19.9 80° (27°)
15.3 90° (32°)
11.9 100° (38°)
RES.
kΩ
9.2
7.4
5.7