Specifications

TM040 16, 18 & 20L Continuous Flow Gas Water Heater Service Instructions
D.O.I: 2/06/2009
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36
Tests 10 and 12 - Diagnostic Point 9
12VDC JAPAN
G5NB-1A4 OMRON
T
R
OMRON G5NB-1A4
12VDC JAPAN
OMRON G5NB-1A4
12VDC JAPAN
OMRON G5NB-1A4
12VDC JAPAN
OMRON G5NB-1A4
12VDC JAPAN 12VDC JAPAN
G5NB-1A4 OMRON
Q
2 - Black
1 - Red
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
connector Q 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
connector Q whilst unplugged from the PCB.
Normal resistance is between 40 ohms and 80
ohms.
Error Code 12
Error Code 12
Is the inlet gas pressure
correct?
Advise customer to contact
installer and correct
NO
Are the min and max burner
pressures correct?
YES
NO
Refer to „Burner Gas
Pressure Check‟
Is there any voltage at the
flame sensors?
TEST 7
YES
Replace PCBNO
Attempt to operate the water
heater by opening a hot tap
Is error code 11 displayed?
Follow the fault finding chart for
error code 11
YES
NO
Adjust the burner pressure
Refer to section on burner gas
pressure adjustment
Check flame sensor wiring for
breaks
Adjust or replace flame sensors
YES