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wiring may be shorted, there may be moisture in the
070 or the 070 may be defective. To test for a
defective 070 sensor, measure the resistance directly at
the 070 sensor location.
Replace the front cover of the 070 sensor enclosure.
Test the Power Supply or Heat Demand.
Make sure exposed wires and bare terminals are not in
contact with other wires or grounded surfaces. Turn on
the power or provide a heat demand and measure the
voltage across the leads. The voltmeter should read
between plus and minus 4 volts of the supplied voltage.
Temperature Resistance Temperature Resistance
o
F
o
C
Ω
Ω
Ω
Ω
Ω
o
F
o
C
Ω
Ω
Ω
Ω
Ω
-50
-46
490,813
90
32
46,218
-45
-43
405,710
95
35
7,334
-40
-40
336,606
100
38
5,828
-35
-37
280,279
105
41
5,210
-30
-34
234,196
110
43
4,665
-25
-32
196,358
115
46
4,184
-20
-29
165,180
120
49
3,760
-15
-26
139,402
125
52
3,383
-10
-23
118,018
130
54
3,050
-5
-21
100,221
135
57
2,754
0
-18
85,362
140
60
2,490
5
-15
72,918
145
63
2,255
10
-12
62,465
150
66
2,045
15
-9
53,658
155
68
1,857
20
-7
46,218
160
71
1,689
25
-4
39,913
165
74
1,538
30
-1
34,558
170
77
1,403
35
2
29,996
175
79
1,281
40
4
26,099
180
82
1,172
45
7
22,763
185
85
1,073
50
10
19,900
190
88
983
55
13
17,436
195
91
903
60
16
15,311
200
93
829
65
18
13,474
205
96
763
70
21
11,883
210
99
703
75
24
10,501
215
102
648
80
27
9,299
220
104
598
85
29
8,250
225
107
553
Temperature/Resistance Chart
