45
C. Thermistor Check
A thermistor (semiconductor) is used for the cabinet control sensor and defrost termination
sensor. The resistance varies depending on temperature. No adjustment is required. If
necessary, check for resistance between thermistor leads and visually check the thermistor
mounting.
Clogged Filter Thermistor T-R Curve
Cabinet & Defrost Thermistor T-R Curve
To check a thermistor's resistance, follow the steps below.
1) Disconnect the connector for the thermistor in question under the control box and
behind the wire guard.
2) Remove the thermistor. See "IV.F. Removal and Replacement of Thermistors."
3) Immerse the thermistor sensor portion in a glass or cup containing ice and water for 2
or 3 minutes.
4) Check for a resistance between thermistor leads. Normal reading is from 5 to 6.5kΩ
for the cabinet and defrost thermistors and 145 to 175kΩ for the clogged filter sensor.
Replace the thermistor if it exceeds the normal reading.
Temperature
Resistance (kΩ)
°F
°C
Cabinet/Defrost Thermistors Clogged Filter Thermistor
0
-17.8
14.2
-
10
-12.2
10.7
-
32
0.0
6.0
160
50
10.0
3.9
100
70
21.1
2.5
59
90
32.2
1.6
36
Temperature °F (°C)
Temperature °F (°C)
Summary of Contents for HUF40A
Page 6: ...6 Units mm in 1a HUR40A D HUF40A D 1 HUR40A HUF40A ...
Page 7: ...7 2 HWR40A HWF40A Units mm in 2a HWR40A D HWF40A D ...
Page 8: ...8 3 HUR68A HUF68A Units mm in 3a HUR68A D HUF68A D ...
Page 9: ...9 4 HWR68A HWF68A Units mm in 4a HWR68A D HWF68A D ...
Page 10: ...10 5 HUR96A 5a HUR96A D Units mm in ...
