Rheem 874W27NF Service Manual page 30

Fault Finding Tests 8, 9 & 11
Using a multimeter set on the AC volts scale, measure the voltage between the two red wires at
base of the ignition module.
Normal voltage should be between 90 – 110VAC.
W
Conduct test with water flowing.
Using a multimeter set on the DC volts scale,
measure the voltage with multi-pin connector
plugged into terminal W on control PCB.
Solenoid Normal
Valve Voltage
GISV
1
2
3
TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
This document is stored and maintained electronically by
Conduct test during ignition attempt.
Test 9
X
4 1
5 2
6 3
2 3 4
5 6 7
Test
Diagnostic Point
Point
1 Yellow
10
8 Black
2 White
12
8 Black
5 Red
13
8 Black
6 Blue
18
8 Black
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled"
Test 8
PLM-110
A.C 100V
3A80505
Z
LED1
5 4 3 2 1
LED
Y
DISPLAY
1 2 3 4
Using a multimeter set on the kilo-ohms scale,
measure the
connector unplugged from terminal W on
control PCB.
Solenoid
Valve
GISV
1
2
3
Test 11
X
4 1
5 2
6 3
W
2 3 4
5 6 7
resistance with
Normal Test
Resistance Point
1 Yellow
8 Black
2 White
8 Black
5 Red
8 Black
6 Blue
8 Black
multi-pin
Diagnostic
Point
10
12
13
18
30