Rheem 874W27NF - Fault Finding Tests 10 & 12-14

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TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
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Fault Finding Tests 10 & 12-14
Tests 10 and 12
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: Isolate power before conducting test.
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 13
Test 14
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.
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.
K
BK R YBR G W
1 2 3 4 5 6 87
R
BK
BK
R
BL
4
2
7
6
5
Y
W
1
2
3
4
BL
O
W
BR
R
BK
4
3
2
1
8
7
6
5
N
O
9
Y
G
5
6
1
2
3
4
SW1 SW2
P
V
3
2
1
T
1
2
S
3
2
1
1
U
1
1
1
2
3
S
2
1
T
1
U
1
2
3
V