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1-2. The fan does not operate when the hot water fixture is opened.
Check whether the Water Flow Sensor is normal.
Normal
Open the hot water fixture fully.
Confirm 2.0 L/min. or more by
using maintenance monitor No.14.
When not using the maintenance
monitor:
CN38
Between Red 3 – Blue 17
DC 14 – 16V
or
CN38
BetweenYellow 5 (+) – Blue 17 (-)
over 6.8 Hz
Check whether the Water inlet thermistor Detection is too high.
(Check the Inlet Water temperature.)
Normal
Does not apply to a
conditon of the right.
Check whether the Water inlet thermistor is normal.
Normal
Check that actual water temperature
and maintenance monitor No.30 match.
When not using the maintenance monitor:
Water inlet thermistor converted from the
resistance between CN63 White 4 - White 2
(refer to the thermistor temperature
characteristics below) and the actually
measured water temperature should be
about the same.
When measuring the resistance,
disconnect the connector and check
the male side.
Water inlet / Water outlet / Heat exchanger Thermistor Temperature Characteristics
Abnormal
W
31
32
R
29
30
V
27
28
BK
O
25
26
G
W
23
24
BK
21
22
19
20
V
BL
17
18
G
O
15
16
O
13
14
BL
11
12
9 10
Y
7 8
R
Y
5 6
Y
R
3 4
BK
1 2
W
<CN38>
Check the voltage between Red 3 and Blue17.
Check the pulses between Yellow 5 and Blue17.
Normal
Abnormal
Abnormal
Set temperature : 50°C or less Water inlet temperature > 50°C
Set temperature : More than 50°C Water inlet temperature > Set temperature
Set temperature + 5°C < (2 x 25) — Total fllow rate + Water inlet temperature
=
Abnormal
1
W
2
W
3
W
4
W
5
W
6
W
7
W
<CN63>
Circuit Board
<CN42>
W
4
1
BK
5
2
<CN101>
6
3
BL
6
1
R
R
7
2
BL
W
8
3
G
9
4
W
O
10
5
Y
1
BK
2
3
W
4
5
W
6
BL
7
BR
8
GY
9
BK
10
O
11
12
W
<CN10>
Abnormal
=
=
Check whether a solar water heater is directly coupled or
whether the hot water fixture is not fully opened.
Circuit Board
<CN42>
W
4
1
BK
5
2
<CN101>
6
3
BL
6
1
R
R
7
2
BL
W
8
3
G
9
4
W
O
10
5
Y
1
BK
2
3
W
4
5
W
6
BL
7
BR
8
GY
9
BK
10
O
11
12
W
<CN10>
- 26 -
<CN186>
1
R
2
BK
MAIN
3
W
4
G
CIRCUIT
5
BL
BOARD
6
BL
W
31
32
1
BL
R
29
30
2
V
27
28
BK
<CN78>
O
25
26
G
W
23
24
BK
21
22
19
20
V
BL
17
18
G
O
15
16
O
1
W
13
14
BL
2
W
11
12
3
W
9 10
Y
4
W
7 8
R
1
BL
5
W
Y
5 6
Y
2
BL
1
2
6
W
R
3 4
BK
3
BL
BK
7
W
1 2
W
<CN63>
<CN38>
<CN89>
<CN197>
Replace the Circuit Board
Check for improper connection of wiring.
Replace the Water Flow Sensor.
Replace the Circuit Board
<CN186>
1
R
MAIN
2
BK
3
W
CIRCUIT
4
G
5
BL
BOARD
6
BL
W
31
32
1
BL
R
29
30
2
V
27
28
BK
<CN78>
O
25
26
G
W
23
24
BK
21
22
19
20
V
BL
17
18
G
O
O
15
16
1
W
13
14
BL
2
11
12
W
3
W
9 10
Y
4
7 8
R
W
1
BL
5
W
Y
5 6
Y
2
BL
1
2
6
W
R
3 4
BK
3
BL
BK
7
W
1 2
W
<CN63>
<CN38>
<CN89>
<CN197>
Check for improper connection of wiring.
Replace the Water inlet thermistor.
Replace the Circuit Board set.
3
3
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