Specifications

TM040 16, 18 & 20L Continuous Flow Gas Water Heater Service Instructions
D.O.I: 2/06/2009
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44
Fault Finding Tests 19 - 22
Test 19 and 20
12VDC JAPAN
F
OMRON G5NB-1A4
12VDC JAPAN
G
TEST 19: Unplug connector G from the PCB and
using a multimeter set on the kilo-ohms scale,
measure the resistance between 3 Green and 6
Green.
Normal resistance should be between 0.6kilo-
ohms and 2.8kilo-ohms.
Conduct test with water flowing
TEST 20: Using a multimeter set on the DC volts
scale, measure the voltage between 3 Green and
6 Green on connector G.
Normal voltage should be between DC70 – 110V.
Test 21 - Diagnostic Point 15
Test 22 - Diagnostic Point 15
MAX.
3 4
B
8
Conduct test with water flowing
Using a multimeter set on the DC volts scale,
measure the voltage at connector B whilst
plugged into PCB.
B
8
2
43
MAX.
Conduct test with water flowing
Using a multimeter set on the DC volts scale,
measure the voltage at connector B whilst
plugged into PCB.
Check Point
Measured Value
Check Point
Measured Value
7 Red - 8 Black
DC8 – 16V
2 White - 8 Black
DC8 – 16V