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A
Check the actual output.
Normal
Should be maintenance monitor
No. 51 (FF + FB No.) x 50% < No. 52 (Output) data.
Check whether the water inlet / water outlet / heat exchanger thermistors are normal.
Normal
Set the"Operation button to the on position, and then
disconnect electrical power, and then open the fixture
(pass through the water to the unit). Close the fixture,
and then reconnect electrical power. Check the
maintenance monitor.
The difference between No.30, No.31 and No.32
should be within ±3 ˚C.
Check the initial / final fan speed correction.
(maintenance monitor No. 48 nad No. 49)
Normal
(100 - 104% : (L)WHiC56, (L)WHiCX56,
106% : (L)WHi49, (L)WHiX49)
Check the thermistor resistance.
Normal
1
CN63 White 4 - White 2 (inlet)
2
CN63 White 1 - White 2 (outlet)
3
CN63 White 3 - White 2 (heat exchanger)
Refer to the thermistor temperature
characteristics below.
Water inlet / Water outlet / Heat exchanger Thermistor Temperature Characteristics
1
2
2
1
2
3
3
3
4
1
5
6
7
<CN63>
Abnormal
- 42 -
Abnormal
Abnormal
Abnormal
Check for improper connection of wiring,
connectors, etc., then replace the thermistor.
When measuring the resistance,
disconnect the connector and check
the male side.
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
W
1
BK
2
3
W
W
4
5
W
W
6
BL
7
BR
W
8
GY
9
BK
W
10
O
11
W
12
W
<CN10>
W
Investigate the cause for the combustion abnormality
(fan clogging, fan sirocco abnormalities, etc.).
<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
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
6
W
R
3 4
BK
3
BL
BK
7
1 2
W
W
<CN63>
<CN38>
<CN89>
<CN197>
Replace the Circuit Board set.
Check for clogged water fixtures,
then replace the Water Flow Sensor.
Replace the Circuit Board set.
2
3
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