Noritz NR501-OD Service Manual page 32

1. No Error Code
1-1. The set temperature is not displayed on Display Window when electrical power is connected.
Operation indicator does not light when turned on.
Check the power outlet voltage.
YES
(AC108 - 132V )
Beware of electric shock due to
short-circuiting of the 120V circuit.
Check the supply voltage of the power circuit board.
Normal
CN92 : Between White 3 - Black 4
AC108 - 132V
Check the current fuse (10A).
Normal (Not blown)
(Only using the optional Remot e Controller)
Chec k the voltage of the Remote
Controller terminals on the Ci r cuit Boar d .
Normal (DC14 - 16V)
CN89A, CN89B
Remove the Remote Controller cord .
NO
Che ck the acti vation of the indoor
distribution board breaker.
Normal (Not activated)
Circuit Board
14
Abnormal
13
12 BL
11 W
10 R
9 Y
8
7
6 BK
5 BK
4 W
3 W
2 BK
1 W
<CN63>
<CN135>
<CN78>
2
1
1 BL 2
3
BL
4
R
5 W
6 O
7 GY
8 BK <CN10>
9
10 W
11 BL
12
6 BK 13 W
14
5 R
15 BL
4
3
2 W
1 W
<CN42>
Check for improper connection of wiring, damage,
s h o - t r i c c r u t i n i g r o g o r u n d a f
,
* Unplug the power cord when checking.
Circuit Board
Abnormal
14
13
(Bl o wn)
12 BL
11 W
10 R
9 Y
8
7
6 BK
5 BK
4 W
3 W
2 BK
1 W
<CN63>
<CN135>
<CN78>
2
1
1 BL 2
3 BL
4 R
5 W
6 O
7 GY
8 BK <CN10>
9
10 W
11 BL
12
6 BK 13 W
14
5 R
15 BL
4
3
2 W
1 W
<CN42>
Abnormal
Circuit Board
14
13
12 BL
11 W
10 R
9 Y
8
7
6 BK
5 BK
4 W
3 R
3 W
2 BK
1 W
2 BL
<CN63>
1 G <CN135>
<CN78>
<CN89B>
<CN101>
2
1
1 BL 2
3 BL
4 R
5 W
6 O
7 GY
8 <CN10>
BK
9
10
W
11 BL
12
6 BK 13 W
5 R 14
15 BL
4
3
2 W
1 W
<CN42>
Check for Remote Controller cord damage, short-circuiting or ground fault,
and if there is no problem replace the Remote Controller.
* If there is cord damage, short- circuiting or ground fault , replace the remote controller cord.
Abnormal (Activated)
<CN92>
12 W
11 Y
10 O
9 R
8
7
Main
6 BK
5 V
Circuit
4 G
3 O
Board
2 Y
1 W
<CN59>
1
2
1 2 3
3 4 3 2 1
4 BL
4 R
3 BL BR Y BL R
5 O
2 BL
6 Y <CN27>
1 R
7 W
<CN142> Po wer
<CN104>
Circuit
3 R
Board
2 BL
1 G
<CN101>
<CN89B>
3
2
1
<CN75>
3 2 1
BL/W R/R G
<CN102>
<CN89A>
Abnormal
u . t l
12 W
11 Y
10 O
9 R
8
7
Main
6 BK
5 V
Circuit
4 G
3 O
Board
2 Y
1 W
<CN59>
1
2
1 2 3
3 4 3 2 1
4 BL
4 R
3 BL BR Y BL R
5 O
2 BL
6 <CN27>
Y
1 R
7
W
<CN142>
Po wer
<CN104>
Circuit
3 R
Board
2 BL
1 G
<CN101>
<CN89B>
3
2
1
<CN75>
3 2 1
BL/W R/R G
<CN102>
<CN89A>
Check for improper connection of wiring, damage ,
shor t-circuiting or ground f ault.
Chec k the voltage between 2 and 3 on "CN101 " connecto r.
Then replace the Ci r cuit Board set.
* It is not necessary to replace the Display Window Circuit Board.
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
1 2 3 2
4 3 2 1
3
4 BL
4 R
3 BL
BR Y BL R
5 O
2 BL
<CN27>
6 Y
1 R
7 W
<CN142>
Po wer
<CN104>
Circuit
3 R
Board
2 BL
1 G
<CN101>
<CN89B>
3
2
1
<CN75>
3 2 1
BL/W R/R G
<CN89A> <CN102>
<CN89A>
32
T urn the breaker on.
* If activated again, eliminate
the cause for activation.
Consult power company.
W 3 1 W
BK 4 2 BK
Display Window
Fuse
Circuit Board
Data
Display
W 3 1 W
BK 4 2 BK
<CN92>
Dip Switch
1 2 3 4
R BL BL BL
<CN142>
Replace the wiring.
Display Window
Circuit Board
Fuse
Data
Display
W 3 1 W
BK 4 2 BK
<CN92>
Dip Switch
1 2 3 4
R BL BL BL
<CN142>
Replace the current fuse (10A).
* If the fuse blows again, eliminate
the cause for the excess current.
Display Window
Fuse
Circuit Board
Data
Display
W 3 1 W
BK 4 2 BK
<CN92>
Dip Switch
1 2 3 4
R BL BL BL
<CN142>