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Error Code 16 Abnormally high output temperature
Check the Water outlet thermistor resistance.
Normal
CN63 : Between White 1 - White 2
Refer to the thermistor temperature
characteristics below.
When measuring the resistance,
disconnect the connector and
check the male side.
Water inlet / Water outlet / Heat exchanger Thermistor Temperature Characteristics
Check the Gas Proportioning Valve.
Normal
Check for the Main Flow Control Valve.
Normal
Error Code 20 High Limit Switch triggered
Check the High Limit Switch resistance.
Normal
CN10
Between White 12 - White 3
1
or less.
When measuring the resistance,
disconnect the connector and
check the male side.
<The occurrence condition for error code 16>
The error message appears if one of the following conditions is present:
- To prevent water at high temperatures from being output,
if the output water temperature is 90°C or more.
- If water 60°C or more is output when the set temperature is 50°C or less.
- If water 10°C or more above the set temperature is output when the set
temperature is 55°C or more.
Abnormal
1
W
2
W
3
W
4
W
5
W
6
W
7
W
<CN63>
It is shown on page 6 ( 2).
It is shown on page 5 ( 1).
Abnormal
Circuit Board
<CN42>
W
4
1
BK
5
2
<CN101>
6
3
1
BK
BL
6
1
R
7
2
2
W
8
3
9
4
3
W
O
10
5
4
5
W
6
BL
7
BR
8
GY
9
BK
10
O
11
<CN10>
12
W
<CN10>
- 34 -
Circuit Board
<CN42>
MAIN
W
4
1
BK
CIRCUIT
5
2
<CN101>
6
3
BL
6
1
R
BOARD
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>
Check for improper connection of wiring.
Replace the Water outlet thermistor.
<CN186>
MAIN
CIRCUIT
R
BOARD
BL
G
W
31
32
W
R
29
30
Y
V
27
28
BK
25
26
O
G
1
BK
W
23
24
BK
2
21
22
3
W
19
20
V
4
BL
17
18
G
5
W
O
15
16
O
6
BL
1
W
13
14
BL
7
BR
2
W
11
12
8
GY
3
W
9 10
Y
9
BK
4
W
7 8
R
10
O
5
W
Y
5 6
Y
11
6
W
R
3 4
BK
12
W
7
W
1 2
W
<CN63>
<CN38>
Check for improper connection of wiring.
Replace the High Limit Switch.
Check for the Primary Heat Exchanger is normal.
(ex. The surface discolors black, clogging, etc.)
Replace the Circuit Board set.
<CN186>
1
R
2
BK
3
W
4
G
5
BL
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
11
12
W
3
9 10
Y
W
4
7 8
R
W
1
BL
5 6
5
W
Y
Y
2
BL
6
1
2
3
W
R
3 4
BK
BL
3
BK
7
W
1 2
W
<CN63>
<CN38>
<CN89>
<CN197>
Replace the Circuit Board set.
1
R
2
BK
3
W
4
G
5
BL
6
BL
1
BL
2
<CN78>
1
BL
2
BL
1
2
3
3
BL
BK
<CN89>
<CN197>
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