Thermistors - GE Profile PDCF1NBW Technical Service Manual

Thermistors

Thermistor Resistance
Temperature Temperature
(°F) (°C)
-40 -40
-31 -35
-22 -30
-13 -25
-4 -20
5 -15
14 -10
23
32
41
50 10
59 15
68 20
77 25
86 30
95 35
104 40
113 45
122 50
131 55
140 60
Note: To accurately test a thermistor, place
the thermistor in a glass of ice and water
(approximately 33°F) for several minutes and check
for approximately 16K Ω.
Ambient Thermistor
The ambient thermistor is located under the freezer
compartment and connected at J1-2 on the main
control board. (See
Component Locator Views
assists the main control board in compensating for
room ambient that is higher or lower than 60°F.
Resistance in Kilo-
Ohms
166.8 kΩ
120.5 kΩ
88 kΩ
65 kΩ
48.4 kΩ
36.4 kΩ
27.6 kΩ
-5 21 kΩ
0 16.3 kΩ
5 12.7 kΩ
10 kΩ
7.8 kΩ
6.2 kΩ
5 kΩ
4 kΩ
3.2 kΩ
2.6 kΩ
2.2 kΩ
1.8 kΩ
1.5 kΩ
1.2 kΩ
.) It
For example, in ambient below 60°F, the fresh food
temperature control will shut down properly. The
cooler room ambient assists in keeping fresh food
temperatures at the preset temperature. However,
the compressor does not get enough run time to
bring the freezer down to 0°F.
At lower room temperatures, the ambient thermistor
alters the main control board's calculations for the
target temperature. The main control board then
runs the compressor at higher speeds to get the
freezer, as well as the fresh food, to an acceptable
temperature.
If the external thermistor is not functioning, the
main control board default will assume the ambient
temperature is 90°F and there will be no adjustment
to the fresh food or freezer set point.
The ambient thermistor is attached to the front
of the cabinet (under the left side of the freezer
compartment) with a plastic wire tie.
Wire Tie
Fresh Food and Freezer Thermistors
The fresh food thermistor is located in the left
wall of the fresh food compartment. The freezer
thermistor is located in the right wall of the freezer
compartment.
Note: The fresh food and freezer thermistors are
removed in the same manner.
To remove the thermistor cover, insert a fl at-blade
screwdriver under the front of the cover and gently
lift the bottom edge until it releases from the
compartment wall.
Insert
– 37 –
Ambient
Thermistor
Thermistor Cover
(Continued next page)