Ignition Failure - Noritz NR501-OD Service Manual

2. Error Code Displayed
Error Codes
Display Remote
Window Controller
11 11
Only connect and disconnect the connector after the fan has
stopped rotating and then disconnect the electrical power.
(The Circuit Board and Fan Motor may be damaged otherwise.)
Chec
YES
Check whether the Igniter is normal.
YES
Check the voltage to the Igniter
(on the connector) .
Check the voltage to the Igniter
(on the Circuit Board) .
Check whether the primary
gas pressure is normal.
Normal
Primary gas pressure list
Check whether the manifold gas pressure is normal.
Abnormal
A B
ck through the peephole of the burner).
NO
NO
Abnormal
Normal
Between : CN42 Black 6 - CN102 Blue/White 3
DC14 - 16 V
Circuit Board
14
13
12 BL
11 W
10
R
9 Y
8
7
6 BK
5 BK
4 W
3 W
2 BK
1 W
<CN63>
<CN78>
6 BK
2
1
1
BL 2
5 R
3 BL
4 R
5 W
4
6 O
7
GY
3
8 BK
9
10 W
2 W
11 BL
12
1 W
6 BK 13
W
5 R 14
15 BL
4
3
<CN42>
2 W
1 W
<CN42>
Abnormal
* Check the primary pressure (dynamic pressure)
at the time of maximum combustion.
Gas group
LP
Pressure
Maximum
inch H O 14.0
2
pressure
Standard
inch H O 11.0
2
pressure
Minimum
inch H O 8.0
2
pressure
Normal
Description
<Condition of occurrence for error code 11>
Display was not possible at the time of initial
ignition due to the causes listed below.
(Defective ignition device, leakage of ignition plug, problem in gas
supply, poor connection of ground wire, defectiv
Normal
DC 14-16V between connector
Check Thermal Fuse and High Limit Switch
Abnormal
conduction, and if 2 or less (Thermal Fuse)
/ 1 or less (High Limit Switch), replace the
Circuit Board.
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
4 3 2 1
3
4 BL
<CN135>
4 R
3 BL
BR Y BL R
5 O
2 BL
6 Y <CN27>
1 R
7 W
<CN142>
<CN104>
3 R
2 BL
1 G
<CN101>
<CN10>
<CN89B>
3
2
1
<CN75>
3 2 1
BL/W R/ R G
<CN102>
<CN89A>
NG
10.5
7.0
4.0
37
Check for improper connection of
ignition plug, then replace the Igniter .
Display Window
Fuse
Circuit Board
Data
Displ ay
W 3 1 W
BK 4 2 BK
Po wer
Circuit <CN92>
Board
Dip Switch
1 2 3 4
R BL BL BL
<CN142>
3 2
BL/W R/R
<CN102>
Replace the Igniter or the Ignition Plug.
Check the gas supply valve, etc .
Check for the Fan Motor clogging, etc.
1
G