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”.
Fault-Finding Tests 1 - 4
Using a multimeter set on the AC volts scale,
measure the voltage between the blue and
brown wires at the inline fuse connectors.
Normal voltage is between 216 and 264VAC.
Using a multimeter set on the ohms scale,
measure across each fuse.
Resistance should be 0 ohms.
Using a multimeter set on the DC volts scale,
measure the voltage between red and grey wires
at terminal I on the control PCB.
Normal voltage is between 144V and 192V DC.
Using a multimeter set on the ohms scale,
measure the resistance between the blue and
brown wires at terminal D whilst the multi-pin
connector is unplugged from the power
supply PCB.
Resistance should be 16-22Ω (outdoor) and
10-14Ω (indoor models).
NOTE: if the value is below 10 ohms it will
cause the fuse to blow during the start up
cycle without fault code being displayed.
12VDC JAPAN
G5NB-1A4
OMRON
12VDC JAPAN
G5NB-1A4
OMRON
12VDC JAPAN
G5NB-1A4
OMRON
OMRON
G5NB-1A4
12VDC JAPAN
12VDC JAPAN
G5NB-1A4
OMRON
Q
9
5
6
7
8
1
2
3
4
4
3
2
1
5
R
1
2
3
S
2
1
T
1
U
1
2
3
V
X
3
1
25
4
6
W
1
5 6 7
8
432
1
2
3
4
4
3
2
1
8
7
6
5
N
O
9
M
5
6
7
8
1
2
3
4
SW1 SW2 SW3
DIP1
1 2 34
ON
OFF
OFF
ON
4321
DIP2
4
3
2
1
7
6
5
P
K
1 2 3 4 5 6 87
2
1
I
1
J
2
3
4
5
6
POWER SUPPLY PCB
TRANSFORMER
E
GY
7
8
9
10
11
12
1
2
3
4
5
6
GY
Y
BK
R
FUSE
5A
1
2
3
4
BL
BR
A
B
12
GR R
1
3
2 5
6
4
C
BL
BK
R
R
D
123
BL
BR
H
GY
G
F
1
2
3
4
5
6
7
8
1
2
3
4
BK
R
W
G
Y
BR
FOR DIRECT VENT
MODEL ONLY
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