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”.
58
Fault Finding Tests 22
– 24
Test 22
This test will require access to the Power Supply PCB. The
Power Supply PCB is mounted on the rear of the Control PCB.
Disconnect the 4 x mounting screws, all plugs and harnesses
from the Control PCB to enable the complete PCB assembly
to be rotated in order to gain access to the Power Supply PCB.
Locate connector D and E on Power Supply PCB. Remove the
protective covers from each connector to enable clear access
for multimeter test probes.
Using a multimeter set on the ohms scale, conduct the four
tests listed below by inserting the multimeter test probes into
the test points as listed.
Test measurements are to be as follows:
Plug
Check Point
Measured Value
Outdoor
Indoor
E
6 Red
– 3 Black
5 - 8
Ω
3 - 6
Ω
E
11 Yellow
– 3 Black
7 - 11
Ω
5 - 8
Ω
E
1 Grey
– 7 Grey
12 - 18
Ω
10 - 16
Ω
D
1 Brown
– 3 Blue
16 - 22
Ω
10 - 14
Ω
Test 23 & 24
Disconnect the fan plug (connector J) from control PCB.
Remove the protective covers from connector J to enable
clear access for multimeter test probes.
Using a multimeter set on the kilo-ohms scale, insert the
multimeter test probes into the test points as listed below
for the specific test being undertaken.
Test measurements are to be as follows:
Test
Check Point
Measured Value
23
6 Red
– 4 Black
(Indoor)
Open Circuit
6 White
– 4 Blue
(Outdoor)
24
3 White
– 4 Black
(Indoor)
34 - 37
kΩ (+/- 5%)
3 Red
– 4 Blue
(Outdoor)
NOTE:
Short circuit at test point 23 will damage the transformer and a short circuit at test point 24 will damage the PCB.
MODEL ONLY
FOR DIRECT VENT
BR
Y
G
W
R
BK
4
3
2
1
8
7
6
5
4
3
2
1
F
G
GY
H
BR
BL
3 2 1
D
R
R
BK
BL
C
4
6
5
2
3
1
R
GR
2 1
B
A
BR
BL
4
3
2
1
5A
FUSE
R
BK
Y
GY
6
5
4
3
2
1
12
11
10
9
8
7
GY
E
TRANSFORMER
POWER SUPPLY PCB