Specifications

TM040 16, 18 & 20L Continuous Flow Gas Water Heater Service Instructions
D.O.I: 2/06/2009
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35
Fault Finding Tests 7 – 12
Test 7 - Diagnostic Point 8
Test 8 - Diagnostic Point 11
K
L
4321
MAX.MIN.
Body Earthing
G
12VDC
G5NB-1A4 OMRON
12VDC JAP
Conduct test with no water flow
Using a multimeter set on the AC volts scale,
measure the voltage between terminals W1 on
connector L and earth and between terminals
R1 on connector K and earth.
Normal voltage should be between AC3 – 20V.
Conduct test with water flowing
Using a multimeter set on the AC volts scale,
measure the voltage between the grey wires at
connector G.
When ignition sequence commences, voltage
should be between 90 - 110VAC until flame is
detected. (Note: Duration is approx 3 seconds)
Test 9
Test 11
OMRON G5NB-1A4
12VDC JAPAN
OMRON G5NB-1A4
12VDC JAPAN
OMRON
5
6
J
1
2
3
G
12VDC
G5NB-1A4 OMRON
12VDC JAP
Using a multimeter set on the DC volts scale,
measure the voltage with connector J plugged
into PCB.
Using a multimeter set on the kilo-ohms scale,
measure the resistance with connector J
unplugged from the PCB.
Solenoid
Valve
Normal
Voltage
Test
Point
Diagnostic
Point
Solenoid Valve
Normal
Resistance
Test
Point
Diagnostic
Point
GISV
DC75 to
DC120V
1 Yellow
5 Black
10
GISV
0.8Kohms
to
2.2Kohms
1 Yellow
5 Black
10
1
2 White
5 Black
12
1
2 White
5 Black
12
2
3 Red
5 Black
13
2
3 Red
5 Black
13