TM031 Integrity 18, 20, 24, 26L Service Instructions REV: B
D.O.I: February 2008
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Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
42
Fault Finding Tests 14
– 22
Isolate power when conducting resistance tests. “Live” components present
during voltage tests, exercise caution.
Tests 14, 15, 18, 19, 20 and 21
NOTE:
Measure the voltage with connector L
plugged into PCB
Measure the resistance with connector L
unplugged from the PCB
Test
Solenoid
Valve
Normal
Voltage
Test Point
Diagnostic
Point
Test
Solenoid
Valve
Normal
Resistance
Test Point
Diagnostic
Point
14
GISV
DC
7
0
t
o
DC10
0
V
9 Yellow
10 Black
11
15
GISV
0
.8
k
ilo
-o
h
m
s
to
2
.2
k
ilo
-o
h
m
s
9 Yellow
10 Black
11
18
1
3 Red
10 Black
13
19
1
3 Red
10 Black
13
2
4 White
10 Black
14
2
4 White
10 Black
14
3
5 Blue
10 Black
15
3
5 Blue
10 Black
15
Tests 16 and 17 - Diagnostic Point 10
Test 22
– Diagnostic Points 6 and 7
Test 16
– Conduct test with water flowing
Measure the voltage with connector B
plugged into PCB. Normal voltage is
between DC1.5 and 8.0V.
Test 17
– Isolate power before conducting
test.
Measure the resistance with connector B
unplugged from the PCB. Normal resistance
is between 42 ohms and 97 ohms.
Error
Code
Maintenance
display code
Diagnostic
Point
Test Point
Measured
Value
32
4y:
Combustion
Chamber
Thermistor
6
5 White
7 Black
@20ºC
–
10.3 kilo-
ohms
@40ºC
–
4.9 kilo-
ohms
33
5y: Hot
Water Outlet
Thermistor
7
4 Red
7 Black