Noritz NRC661-DV, Service Manual, Page: 44 / 78

44
CN63 : Between White 3 - Black 2
DC 1 - 4.5V
Resistance : Refer to the table below.
When measuring the resistance,
disconnect the connector and
check the male side.
Normal Abnormal
Chec k the Ther mistor - Heat Exchanger open or short circuit.
* It is not necessary to replace the
Display Window Circuit Board.
Thermistor - Heat Exchanger abnormality
Error Codes
Description
331 (Open)
332 (Short)
33
Display
Window
Remote
Controller
Check for improper connection of wiring.
Replace the Circuit Board set.
Replace the Thermistor - Heat Exchanger.
14
13
12
11
10
9
8
7
6
5
4
3
2
1
BL
W
R
Y
BK
BK
W
W
BK
W
<CN63>
Display Window
Circuit Board
Dip Switch
Data
Display
1 2 3 4
R BL BL BL
<CN142>
14
13
12
11
10
9
8
7
6
5
4
3
2
1
12
11
10
9
8
7
6
5
4
3
2
1
3
2
1
W
Y
O
R
BK
V
G
O
Y
W
4
3
2
1
BL
BL
BL
R
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
3
4
5
6
7
4 3 2 1
BR Y BL R
R
O
Y
W
BL
R
W
O
GY
BK
W
BL
W
BL
2
1
BL/W
BK BK 4 2
W W
Fuse
3 1
R/R G
3 2 1
BL
6
5
4
3
2
1
BK
R
W
W
3
2
1 R
BL
G
BL
W
R
Y
BK
BK
W
W
BK
W
<CN63>
<CN135>
<CN78>
<CN59>
<CN142>
<CN104>
<CN27>
<CN92>
<CN101>
<CN10>
<CN75>
<CN102> <CN89A>
<CN89B>
<CN42>
Main
Circuit
Board
Po wer
Circuit
Board
Circuit Board
1 2 3
Check the Thermistor - Exhaust open or short circuit .
CN63 : Between Black 6 - Black 2
When measuring the resistance,
disconnect the connector and
check the male side.
Normal Abnormal
Refer to the thermistor temperature
characteristics below .
* It is not necessary to replace the
Display Window Circuit Board.
Thermistor - Exhaust abnormality DV model only
Error Codes
Description
351, 353 (*1)
352, 354 (*2)
35
Display
Window
Remote
Controller
Thermistor
Open
Short
During combustion
353
354
Except during combustion
351
352
Check for improper connection of wiring.
Replace the Circuit Board set.
Replace the Thermistor - Exhaust.
The detail about (*1) and (*2)
14
13
12
11
10
9
8
7
6
5
4
3
2
1
BL
W
R
Y
BK
BK
W
W
BK
W
<CN63>
Display Window
Circuit Board
Dip Switch
Data
Display
1 2 3 4
R BL BL BL
<CN142>
14
13
12
11
10
9
8
7
6
5
4
3
2
1
12
11
10
9
8
7
6
5
4
3
2
1
3
2
1
W
Y
O
R
BK
V
G
O
Y
W
4
3
2
1
BL
BL
BL
R
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
3
4
5
6
7
4 3 2 1
BR Y BL R
R
O
Y
W
BL
R
W
O
GY
BK
W
BL
W
BL
2
1
BL/W
BK BK 4 2
W W
Fuse
3 1
R/R G
3 2 1
BL
6
5
4
3
2
1
BK
R
W
W
3
2
1 R
BL
G
BL
W
R
Y
BK
BK
W
W
BK
W
<CN63>
<CN135>
<CN78>
<CN59>
<CN142>
<CN104>
<CN27>
<CN92>
<CN101>
<CN10>
<CN75>
<CN102> <CN89A>
<CN89B>
<CN42>
Main
Circuit
Board
Po wer
Circuit
Board
Circuit Board
1 2 3