Rheem 862 27 Series Service Instructions Manual page 49

Fault Finding Tests 10 & 12 - 14
Test 13
1
3
S 2
1
2
T
1
1
U
3
2
V
1
Conduct test with flame present.
Using a multimeter set on the AC volts scale,
measure the voltage between W1 at terminal U
and earth.
Normal voltage should be 1 - 100VAC.
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".
Tests 10 and 12
BK R BR Y G W SW1 SW2
1 2 3 4 5 6 7 8
K
7 BL
6
W
5 Y
N
4
R O
9
BK
4 8
BK
2 BK
3 7 R 6
R
2 6 G 5
P 1 5 4
Y
4 BL 3
3 2
O
2 1
W
1 BR
Test 10: Conduct test with water flowing.
Using a multimeter set on the DC volts scale,
measure the voltage between 1 Red and 2 Black
at terminal P whilst plugged into PCB.
Normal voltage is between DC1.5 and 14.0V.
Test 12:
Using a multimeter set on the ohms scale, measure
the resistance between 1 Red and 2 Black at
terminal P whilst unplugged from the PCB.
Normal resistance is between 40 ohms and 80
ohms.
Test 14
1
3
S 2
1
2
T
1
U
1
3
2
V
1
Unplug multi-pin connector from terminal T on
control PCB and using a multimeter set on the
kilo-ohms scale, measure the resistance of the
Over Heat Limiter assembly.
Normal resistance should be between 50 - 500
kilo-ohms.
49