Rheem 871018 Service Instructions Manual page 42

Fault Finding Tests 14 – 22
Isolate power when conducting resistance tests. "Live" components present
during voltage tests, exercise caution.
Solenoid Normal
Test
Valve Voltage
14 GISV
1
18 2
3
Tests 16 and 17 - Diagnostic Point 10
Test 16 – Conduct test with water flowing
Measure the voltage with connector B
plugged into PCB.
between DC1.5 and 8.0V.
Test 17 – Isolate power before conducting
test.
Measure the resistance with connector B
unplugged from the PCB. Normal resistance
is between 42 ohms and 97 ohms.
TM031 Integrity 18, 20, 24, 26L Service Instructions REV: B
D.O.I: February 2008
This document is stored and maintained electronically by
Tests 14, 15, 18, 19, 20 and 21
Diagnostic
Test Point
Point
9 Yellow
11
10 Black
3 Red
13
10 Black
4 White
14
10 Black
5 Blue
15
10 Black
Normal voltage is
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled"
NOTE:
Measure the voltage with connector L
plugged into PCB
Measure the resistance with connector L
unplugged from the PCB
Solenoid
Test
Valve Resistance
15 GISV
1
19 2
3
Test 22 – Diagnostic Points 6 and 7
Error Maintenance Diagnostic
Code display code
4y:
Combustion
32
Chamber
Thermistor
5y: Hot
33 Water Outlet
Thermistor
42
Normal
Test Point
9 Yellow
10 Black
3 Red
10 Black
4 White
10 Black
5 Blue
10 Black
Test Point
Point
5 White
6
7 Black
4 Red
7
7 Black
Diagnostic
Point
11
13
14
15
Measured
Value
@20ºC –
10.3 kilo-
ohms
@40ºC –
4.9 kilo-
ohms