Appliance Tech Info

Service Information For Appliance Repair Professionals

GE Refrigerator F8 Error Code

Thermistor Error

F8

The ambient air thermistor (temperature sensor) signal is invalid.

GE Refrigerator F8 Error Code Error Code Possible

Common General Electric (GE) Refrigerator Thermistor Resistance Chart

See additional thermistor resistance charts below.

Resistance kΩ Temperature ℉ Temperature ℃
168.800 -40 -40
120.500 -31 -35
88.000 -22 -30
65.000 -13 -25
48.400 -4 -20
36.400 5 -15
27.600 14 -10
21.000 23 -5
16.300 32 0
12.700 41 5
10.000 50 10
7.800 59 15
6.200 68 20
5.000 77 25
4.000 86 30
3.200 95 35
2.600 104 40
2.200 113 45
1.800 122 50
1.500 131 55
1.200 140 60

How to Test a General Electric (GE) Fridge Thermistor – Method 1

Without temperature sensor (thermistor) removal

  1. Unplug the Refrigerator

    • Always start by disconnecting power to avoid electric shock

  2. Locate the Main Control Board

    • In most General Electric (GE) fridges the main control board is usually located behind a cover on the backside of the refrigerator cabinet

    • Non adaptive control boards can be located at the temperature control inside the fridge

    • Check your model’s tech sheet or service manual for more information

  3. Locate the Thermistor Connections on the Main Control Board

  4. Set Your Multimeter to Ohms (Ω)

    • Select the kΩ (kiloohm) resistance range if it’s not auto-ranging

  5. Measure Resistance at Room Temperature

    • Disconnect the thermistor (J1) connector from the control board

    • Testing is done from the connector not the control board

      • DO NOT INSERT PROBES INTO THE CONNECTOR TERMINAL

      • This will damage the connector and cause a poor connection

    • Touch one meter probe to the outside of the common connector terminal

    • Touch the other meter probe to the outside of the thermistor connector terminal

    • Compare the reading to the appropriate chart based on the actual compartment temperature

  6. Test in Ice Water for Accuracy

    • Submerge the thermistor in a cup of ice water for 5 minutes to simulate a 32°F environment

    • Touch the meter probes to the thermistor connector terminals

    • Compare the reading to the appropriate chart based on a temperature of 32°F

Common Thermistor Connections at the Main Board

How to Test a General Electric (GE) Fridge Thermistor – Method 2

Requires temperature sensor (thermistor) removal

  1. Unplug the Refrigerator

    • Always start by disconnecting power to avoid electric shock

  2. Locate the Temperature Sensor (Thermistor)

    • In a General Electric (GE) fridge temperature sensors (thermistors) are usually clipped to the evaporator coils or mounted inside the fresh food or freezer compartments

    • Check your model’s tech sheet or service manual for more information

  3. Remove the Temperature Sensor (Thermistor)

    • You may need to remove a panel to access it

    • Disconnect the temperature sensor (thermistor) from the wiring harness

      • If there is no connector you will need to cut the harness

      • Be sure to leave enough wire on the main harness to reconnect

  4. Set Your Multimeter to Ohms (Ω)

    • Select the kΩ (kiloohm) resistance range if it’s not auto-ranging

  5. Measure Resistance at Room Temperature

    • Touch the meter probes to the thermistor wires

    • Compare the reading to the appropriate chart

  6. Test in Ice Water for Accuracy

    • Submerge the thermistor in a cup of ice water for 5 minutes to simulate a 32°F environment

    • Touch the meter probes to the thermistor wires

    • Compare the reading to the appropriate chart based on a temperature of 32°F

Additional General Electric (GE) Refrigerator Thermistor Charts

Some Late Model GE Fridges and Freezers

Resistance kΩ Temperature ℉ Temperature ℃
121.000 -58 -50
33.800 -22 -30
25.200 -13 -25
8.000 24.8 -4
6.350 32 0
6.036 33.8 1
5.740 35.6 2
5.460 37.4 3
5.195 39.2 4
4.944 41 5
4.707 42.8 6
4.482 44.6 7
4.270 46.4 8
4.068 48.2 9
3.878 50 10
3.697 51.8 11
3.526 53.6 12
3.636 55.4 13
3.209 57.2 14
3.063 59 15
2.924 60.8 16
2.793 62.6 17
2.500 68 20
2.000 77 25
1.600 86 30
1.100 104 40
1.000 109.4 43
0.700 122 50

General Electric (GE) Ice Box Thermistor Chart

Resistance kΩ Temperature ℉ Temperature ℃
25.300 -13 -25
18.900 -4 -20
14.300 5 -15
10.900 14 -10
8.300 23 -5
6.400 32 0
5.000 41 5
3.900 50 10
3.100 59 15
2.500 68 20
2.000 77 25
1.600 86 30
1.300 95 35
1.100 104 4

General Electric (GE) Ice Maker Mold Thermistor Chart

Resistance kΩ Temperature ℉ Temperature ℃
205.000 -40 -40
71.020 -4 -20
43.670 14 -10
27.700 32 0
25.370 35.6 2
23.270 39.2 4
18.070 50 10
14.750 59 15
12.110 68 20
10.000 77 25
8.301 86 30
3.011 140 60
1.670 176 80

General Electric (GE) Under Counter Ice Maker Thermistor Chart

Resistance kΩ Temperature ℉ Temperature ℃
81.715 – 99.874 0 -18
59.422 – 72.627 10 -12
30.266 – 36.992 32 0
18.219 – 22.267 50 10
10.280 – 12.564 70 21
6.387 – 7.807 90 32

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This information is provided for educational purposes only. Please consult the appropriate Service Mode or Technical Document for your model. Always take proper safety precautions when installing or repairing any major appliance.