Rheem 874W27NF - Fault-Finding Tests 5 - 7

27
TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
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Fault-Finding Tests 5 - 7
Test 5
Test 6
Conduct test with no water flow.
Using a multimeter set on the DC volts scale,
measure the voltage between 3 Red and 2 Black
at terminal S on the control PCB.
Normal voltage should be between DC11 – 17V.
Conduct test with water flowing.
Using a multimeter set on the DC volts scale,
measure the voltage between 1 Brown and 2
Black at terminal S on the control PCB.
Normal voltage should be between DC2 – 5V.
Test 7
Remove the flow sensor turbine. Refer to „Flow Sensor Turbine‟ procedure on page 53.
Check for excessive wear of turbine or blockage by foreign material such as thread tape. The power
must be isolated during water flow sensor removal.
G5NB-1A4
OMRON
G5NB-1A4
OMRON
G5NB-1A4
OMRON
OMRON
G5NB-1A4
G5NB-1A4
OMRON
4
3
2
1
R
1
2
3
S
2
1
T
1
U
1
2
3
V
V
3
2
1
U
1
T
1
2
S
3
2
1
R
1
2
3
4
OMRON
G5NB-1A4
G5NB-1A4
OMRON
OMRON
G5NB-1A4
OMRON
G5NB-1A4
OMRON
G5NB-1A4
Control Assembly
Water Volume
PGFR
Flow Sensor Turbine
Lock ring