Condensate Container Clogging; Thermistor - Air Abnormality - Noritz NR501-OD Service Manual

Error Codes
Display Remote
Window Controller

Condensate Container clogging

29 29
Check the drain line is clogged or frozen.
Normal
C h e k c h t e w t a r e e l e v e l e l t c o r
Normal
Disconnect the wiring connector of the
water level electrode
the maintenance monitor # 19 to kno w
the cause.
[000] : Normal
[001] : Abnormal.
<When not using the maintenance monitor>
CN63 : Between White 11 - Black 2
DC 4.5 - 4.9V
Error Codes
Display Remote
Window Controller
301 (Open)
30

Thermistor - Air abnormality

302 (Short)
Check the Ther mistor - Air open or short circuit.
Normal
CN63 : Between Black 5- Black 2
DC 0.7 - 4.4V
Resistance : Refer to the table below.
When measuring the resistance,
disconnect the connector and
check the male side.
Abnormal
d e f o h t e C o n d e n a s e t C o n tainer.
Abnormal
Circuit Board
rm
14
14
13 13
12 BL
11 W
12 BL
10 R
9 Y
8
11 W
7
6
BK
10 R
5 BK
4 W
3 W
9 Y
2 BK
1 W
8
<CN63>
7
6 BK
<CN78>
5 BK
2
1 BL
4 W
3 W
2 BK
1 W
6 BK
5 R
<CN63>
4
3
2 W
1 W
<CN42>
The maintenance monitor # 19
is displaying [001].
Abnormal
Circuit Board
14
14
13
13
12
BL
11 W
12 BL
10 R
9 Y
8
11 W
7
6 BK
10 R 5 BK
4
W
3 W
9 Y
2 BK
1 W
8
<CN63>
7
6
BK
<CN78>
5 BK
2
1 BL
4 W
3 W
2 BK
1 W
6 BK
5 R
<CN63>
4
3
2 W
1 W
<CN42>
42
Description
<Condition of occurrence for error code 29>
The error message is displayed if water level electrode is shorted.
12 W
11 Y
10 O
9 R
8
7
Main
6 BK
5 V
Circuit
4 G
Board 3 O
2 Y
1 W
<CN59>
1
2
1 2 3
3 4 3 2 1
4 BL
<CN135> 4
R
3 BL BR Y BL R
5
O
2 BL
<CN27>
6 Y
1 R
7 W
<CN142>
<CN104>
3 R
1
2
2 BL
3
BL
1 G
4 R
5 W
<CN101>
6 O
7 GY
8 BK <CN10>
9
10 W
<CN89B>
11 BL
3
12
2
13 W
1
14
15 BL
<CN75>
3 2 1
BL/W R/R G
<CN89A> <CN102>
Check for wiring damage, short-circuiting .
* It is not necessary to replace the
Description
12 W
11 Y
O
10
9 R
8
7
Main
6 BK
5 V
Circuit
4 G
Board 3 O
2 Y
1 W
<CN59>
1
2
1 2 3
3 4 3 2 1
4 BL
<CN135>
4 R
3 BL BR Y BL R
5 O
2 BL
6 <CN27>
Y
1 R
7 W
<CN142>
<CN104>
3 R
1
2
2 BL
3 BL
4 1 G
R
5 W
<CN101>
6 O
7 GY
8 BK <CN10>
9
10 W
<CN89B>
11
BL
3
12
2
13 W
1
14
15 BL <CN75>
3 2 1
BL/W R/R G
<CN89A> <CN102>
Check for improper connection of wiring.
Replace the Thermi stor - Air .
* It is not necessary to replace the
Check for the clogging of the
Condensate Container drain system.
Displ ay Window
Fuse
Circuit Board
Data
Display
W 3 1 W
BK 4 2 BK
Po wer
Circuit
<CN92>
Board
Dip Switch
1 2 3 4
R BL BL BL
<CN142>
Replace the Circuit Board set .
Displ ay Window Circuit Board.
Replace the Condensate Container .
Displ ay Window
Fuse
Circuit Board
Data
Display
W 3 1 W
BK 4 2 BK
Po wer
Circuit
<CN92>
Board
Dip Switch
1 2 3 4
R BL BL BL
<CN142>
Replace the Circuit Board set.
Displ ay Window Circuit Board.