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B
Open the hot water fixture, and confirm the display
of remote controller.
Normal
Abnormal
(Operation indicator
(Show 66)
(Not show 66))
Check the voltage of the bypass flow control valve.
(Check while the bypass flow control valve is activating,
for example when the "Operation" button is turned off
or change the set temperature.)
CN38
1
White 23 - Orange 25 DC1 - 16V
2
White 23 - Green 26 DC1 - 16V
3
White 23 - Violet 27 DC1 - 16V
4
White 23 - Black 28 DC1 - 16V
(Actual value is around DC2V.)
Check whether the primary gas pressure is normal.
Normal
Abnormal
* Check the primary pressure (dynamic pressure) at the time of maximum combustion.
Check whether the manifold gas pressure is normal.
Normal
Abnormal
Check whether the manifold gas
pressure can be adjusted.
2
Impossible
Check the voltage of the Gas
Proportioning Valve.
Normal
CN101:Between Red 7 - Blue 6
When adjusting the manifold
gas pressure, the voltage
changes within the range
DC 0.3 - 15V.
B
Abnormal
Circuit Board
<CN42>
W
31
32
W
4
1
BK
5
2
R
29
30
6
3
V
27
28
BK
4
3
1
O
25
26
G
2
W
23
24
BK
2
1
21
22
3
4
19
20
V
BL
G
17
18
O
15
16
O
13
14
BL
11
12
9 10
Y
7 8
R
5 6
Y
Y
R
3 4
BK
1 2
W
<CN38>
Possible
Abnormal
Circuit Board
<CN42>
W
4
1
BK
5
2
6
3
BL
6
1
R
R
7
2
BL
W
8
3
G
9
4
W
O
10
5
Y
<CN101>
- 28 -
Replace the circuit board set.
MAIN
CIRCUIT
<CN101>
BOARD
BL
6
1
R
R
7
2
BL
W
8
3
G
W
31
9
4
W
R
29
O
10
5
Y
V
27
O
25
1
BK
W
23
2
21
3
W
19
4
BL
17
5
W
O
15
6
BL
1
W
13
7
2
11
BR
W
8
GY
3
W
9 10
9
BK
4
7 8
W
10
O
5
W
Y
5 6
11
6
W
R
3 4
12
W
7
W
1 2
<CN10>
<CN63>
<CN38>
Check for improper connection of wiring,
then replace the bypass flow control valve.
Check the gas supply valve, etc.
Primary gas pressure list
Gas group
Pressure
Maximum
kPa
pressure
Minimum
kPa
pressure
Recheck after adjusting
the manifold gas pressure.
* The procedure of Manifold Gas
Adjustment is described in page **.
Replace the Circuit Board set.
MAIN
CIRCUIT
<CN101>
BOARD
BL
6
1
R
R
7
2
BL
W
8
3
G
W
31
9
4
W
R
29
O
10
5
Y
V
27
O
25
1
BK
W
23
2
21
3
W
19
4
BL
17
5
W
O
15
6
BL
1
W
13
7
2
11
BR
W
8
GY
3
W
9 10
9
BK
4
7 8
W
10
O
5
W
Y
5 6
11
6
W
R
3 4
12
W
7
W
1 2
<CN10>
<CN63>
<CN38>
Check for improper connection of wiring,
then replace the Gas Proportioning Valve.
<CN186>
1
R
2
BK
3
W
4
G
5
BL
6
BL
32
1
BL
30
2
28
BK
<CN78>
26
G
24
BK
22
20
V
18
G
16
O
14
BL
12
Y
R
1
BL
Y
2
BL
1
2
3
BK
3
BL
BK
W
<CN89>
<CN197>
ULPG
NG
3.5
3.0
2.75
1.13
<CN186>
1
R
2
BK
3
W
4
G
5
BL
6
BL
32
BL
1
30
2
28
BK
<CN78>
26
G
24
BK
22
20
V
G
18
16
O
14
BL
12
Y
R
1
BL
Y
2
BL
1
2
3
BK
3
BL
BK
W
<CN89>
<CN197>
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