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Thermister Resistance Testing
Upper Thermister:
1. Determine resistance value of upper thermister. Test across
grey wires. (see photo 9).
2. Draw quart of water off T&P valve. Using a thermometer,
determine water temperature.
3. Use table below to verify correct resistance per water
temperature measured.
Lower Thermister:
1. Determine resistance value of lower thermister. Test across
blue wires. (see photo 10).
2. Draw quart of water off Drain Valve. Using a thermometer,
determine water temperature.
3. Use table below to verify correct resistance per water
temperature measured.
Are readings
N
correct?
Y
Check harness
N
continuity.
Continuity okay?
Y
Replace
thermostat
board
Example: If water temperature is 84°F, then the resistance through the sensor would be 8449 (see shaded area).
°F
0
40
26109
50
19906
60
15314
70
11884
80
9299
90
7333
100
5827
110
4663
120
3758
130
3048
140
2488
150
2043
160
1688
170
1402
180
1170
190
982
200
828
Replace
thermister
Replace
harness
Be Careful When Making Resistance
Measurements Not to Damage or
Deform Connectors or Connector Pins.
Thermister Resistance at Various Temperatures
NOTE: Sensor resistance increases as the temperature falls.
In Degrees F
1
2
3
25400
24712
24045
19383
18876
18383
14925
14548
14180
11592
11308
11032
9078
8862
8653
7165
7000
6839
5697
5570
5446
4562
4464
4368
3679
3602
3527
2986
2925
2866
2439
2391
2344
2004
1966
1928
1656
1625
1595
1376
1351
1327
1150
1129
1110
965
949
933
814
801
788
SERVICE PROCEDURE D24-I
Thermostat Circuit Testing
Upper thermister location
(applicable models)
9
Lower thermister
access located inside
control box.
10
CAUTION
4
5
6
23399
22771
22163
17905
17440
16990
13823
13477
13140
10763
10502
10248
8449
8250
8057
6683
6531
6383
5326
5208
5094
4274
4183
4094
3453
3382
3312
2808
2752
2697
2298
2253
2209
1891
1856
1820
1566
1537
1509
1303
1280
1257
1090
1071
1053
917
901
886
775
762
749
Page 7
7
8
9
21573
21000
20445
16553
16128
15715
12812
12494
12185
1000
9760
9526
7869
7685
7507
6238
6098
5961
4982
4873
4767
4006
3922
3839
3244
3177
3112
2643
2590
2538
2166
2124
2083
1786
1753
1720
1481
1454
1427
1235
1213
1191
1035
1017
999
871
857
842
737
725
713
7
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