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DIAGNOSTIC TEST POINTS (cont)
Measurement Point
No.
Connection
D
D
23
E
THERMISTOR RESISTANCE CHART
0
23.73
2
21.733
4
19.925
6
18.286
8
16.799
10
15.449
12
14.221
14
13.104
16
12.086
18
11.157
20
10.309
22
9.534
24
8.826
FAULT FINDING
When measuring resistance of a part, turn off the electric power and be sure to
disconnect the part completely before measuring (from connector or terminal).
Resistance checks are performed on the part while it is disconnected from the
control board.
"Live" testing to be conducted. Personal Protective Clothing (PPE) shall
be worn to reduce the risk of electric shock. Refer to Rheem Safety
Procedure on electrical testing.
All Molex connections only go to one location and fit one way. You do not need
to force a connection.
CAUTION: When performing maintenance and/or servicing the water
heater, wait for the water heater to become cool. Be careful to avoid injury
on the sharp edges.
TM049 27L Continuous Flow Service Instructions
REV AL – Issued April 2019
This document is stored and maintained electronically by Rheem Technical Support. All printed copies are deemed "uncontrolled".
Wire Colour
BR1 – BL3 (outdoor)
BR1 – BL3 (indoor)
BK3 – Y11 (outdoor)
BK3 – Y11 (indoor)
BK3 – R6 (outdoor)
BK3 – R6 (indoor)
GY1 – GY7 (outdoor)
GY1 – GY7 (indoor)
26
8.177
28
7.583
30
7.037
32
6.536
34
6.076
36
5.653
38
5.264
40
4.905
42
4.574
44
4.269
46
3.987
48
3.726
50
3.485
Normal Value
16 - 22Ω
10 - 14Ω
7 - 11Ω
5 - 8Ω
Transformer.
5 - 8Ω
3 - 6Ω
12 - 18Ω
10 - 16Ω
52
3.262
54
3.055
56
2.863
58
2.686
60
2.52
62
2.367
64
2.225
66
2.092
68
1.968
70
1.853
72
1.746
74
1.646
76
1.552
Point to Check
78
1.465
80
1.384
82
1.307
84
1.236
86
1.169
88
1.106
90
1.048
92
0.993
94
0.941
96
0.893
98
0.847
40
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