Fault Finding Tests - Rheem 874W27NF Service Manual

Fault Finding Tests 18 - 23

Test 20 & 21
BK R
4 5 6
6
5
4
3
2
1
Conduct test with water flowing
Using a multimeter set on the DC volts scale,
measure the voltage at connector N whilst
plugged into PCB.
Test Check Point
20 7 Red - 8 Black
21 2 White - 8 Black
TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
This document is stored and maintained electronically by
Tests 18 & 19
Using a multimeter set on the DC volts scale, measure the
voltage at connector J whilst plugged into PCB.
Test
18
19
BR Y G W SW1 SW2
7 8
Y
N
R
9
BK
4 8
BK
BK
3 7 6
R
R
2 6 G 5
P
1 5 Y 4
4 3
BL
3 2
O
W 1
1 BR
Measured Value
DC8 – 16V
DC8 – 16V
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled"
Conduct test with water flowing
Check Point
6 White – 4 Blue
3 Red – 4 Blue
(or measurement by pulse
1 Yellow – 4 Blue
Test 22 & 23
W
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
22 7 Red - 8 Black
23 2 White - 8 Black
Measured Value
DC144 - 192V
DC12 - 18V
DC4 - 10V
counter of not less than
4800 pulses per minute)
SW1 SW2 SW3
N M
O
9 8
BK
4 8 BK 7 R
3 7 R 6 G
2 6 G 5 Y
Y 4 BL
3 O
W
2 W 1 BR
1 BR
Measured Value
DC8 – 16V
DC8 – 16V
40