Remote Controller Transmission Abnormality; Display Window Transmission Abnormality - Noritz NR501-OD Service Manual

Error Codes
Display Remote
Window Controller

Remote Controller transmission abnormality

No Display 760
Check the voltage of Remote Controller terminal on Circuit Board .
Normal
CN89A-CN89B
DC14-16V
Remove the Remote Controller cord.
Error Codes
Display Remote
Window Controller

Display Window transmission abnormality

768 76
Check the wiring connection between Main Circuit Board and Display Window Circuit Board
Normal
CN142 : Blue 4 (on Main Circuit Board)
CN142 : Blue 4 (on Display Window Circuit Board)
1 or less
Check the connection.
(Wiring should be snap together)
Description
Abnormal
Circuit Board
14
12 W
13
11 Y
12 BL
10 O
11 W
9 R
10 R
8
9 Y
7
8 Main
6 BK
7
5 V
Circuit
6 BK
4 G
5 BK
Board 3 O
4 W
2 Y
3 W
1 W
2 BK
<CN59>
1 W
1
<CN63>
1 2 3 2
3
4 BL
<CN135>
4 R
3 BL
5 O
2 BL
6 Y
1 R
7 W
<CN142>
<CN104>
<CN78>
<CN89B>
2 3 R
1
1 BL 2
2 BL
3 BL
4 R 1 G
5 W
<CN101>
6 O
7 GY
8
BK <CN10>
9
10 W
<CN89B>
11 BL
3
12
2
6 BK 13 W
1
5 R 14
15 BL <CN75>
4
3
3
2 W
BL/W
1 W
<CN42> <CN89A> <CN102>
<CN89A>
Check for Remote Controller cord damage, short - circuiting or ground fault.
If there is no problem, replace the Remote Controller.
Description
Abnormal
Circuit Board
14
12 W
13
11 Y
12
BL
10 O
11 W
9 R
10 R
8
9 Y
7
8
Main
6 BK
7
5 V
Circuit
6 BK
4 G
5 BK
Board 3 O
4 W
2 Y
3 W
1 W
2 BK
<CN59>
1
W
<CN63>
1 2 3
4 BL
<CN135>
3 BL
2 BL
1 R
<CN142>
<CN104>
<CN78>
2 3 R
1
1 BL 2
2 BL
3 BL
4 R 1 G
5 W
<CN101>
6 O
7
GY
8 BK <CN10>
9
10 W
<CN89B>
11 BL
3
12
2
6 BK
13 W
1
5 R 14
15 BL <CN75>
4
3
2 W
1 W
<CN42> <CN89A>
Check for between Main Circuit Board and Display Window Circuit Board cord
for damage, short - circuiting or ground fault.
Disconnect the electrical power, and then reconnect the electrical power.
If the error code is displayed again, replace the Circuit Board set and Display
Window Circuit Board.
48
Fuse
4 3 2 1
W 3 1 W
BR Y BL R
<CN27>
BK 4 2 BK
Po wer
Circuit
<CN92>
Board
2 1
R/ R G
Check for improper connection of wiring,
then replace the Circuit Board set.
* It is not necessary to replace the Display
Window Circuit Board.
<CN142>
4 BL
3 BL
2 BL
1 R
Fuse
1
2
4 3 2 1
3
W 3 1 W
4 R
BR Y BL R
5 O
6 Y <CN27>
BK 4 2 BK
7 W
Po wer
Circuit
<CN92>
Board
3 2 1
BL/W R/R G
<CN102>
Check for improper connection of wiring,
then replace the Wiring.
Display Window
Circuit Board
Data
Displ ay
Dip Switch
1 2 3 4
R BL BL BL
<CN142>
Display Window
Circuit Board
Data
Display
Dip Switch
1 2 3 4
R BL BL BL
<CN142>
1 2 3 4
R BL BL BL
<CN142>