Rheem 874W27NF - Fault Finding Tests 18 - 23

40
TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
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Fault Finding Tests 18 - 23
Tests 18 & 19
Conduct test with water flowing
Using a multimeter set on the DC volts scale, measure the
voltage at connector J whilst plugged into PCB.
Test
Check Point
Measured Value
18
6 White – 4 Blue
DC144 - 192V
3 Red – 4 Blue
DC12 - 18V
19
1 Yellow – 4 Blue
DC4 - 10V
(or measurement by pulse
counter of not less than
4800 pulses per minute)
Test 20 & 21
Test 22 & 23
Conduct test with water flowing
Using a multimeter set on the DC volts scale,
measure the voltage at connector N whilst
plugged into PCB.
Conduct test with water flowing
Using a multimeter set on the DC volts scale,
measure the voltage at connector M whilst
plugged into PCB.
Test
Check Point
Measured Value
Test
Check Point
Measured Value
20
7 Red - 8 Black
DC8 – 16V
22
7 Red - 8 Black
DC8 – 16V
21
2 White - 8 Black
DC8 – 16V
23
2 White - 8 Black
DC8 – 16V
BK R YBR G W
4 5 6 87
R
BK
BK
R
4
2
6
5
P
Y
1
2
3
4
BL
O
W
BR
R
BK
4
3
1
8
7
6
5
N
9
Y
G
5
6
1
2
3
4
SW1 SW2
1
3
SW3SW2SW1
BL
O
W
BR
R
BK
Y
G
4
3
1
8
7
6
5
M
G
Y
9
O
N
6
7
8
1
2
BK
R
BR
W
4
3
2
W