Noritz NR501-OD Service Manual page 39

A
Check that combustion conditions are normal.
Normal Abnormal
Chec k whether the primar y gas pressure
(dynamic pressure) is normal.
Normal
Chec k whether the manifold gas pressure
and fan speed are normal.
Normal
Compare the data indicated on maintenance monitor # 10 and # 20.
C e h k c w h t e e h t r e h B r u e n o r i n d n
Shown *
Fully close the gas supply valve
With the remote controller turned on (if connected) and open
the hot water ture.
The unit starts sparking, and then connect the Dummy Flame
between the ame rod and ear th. Check whether "Burner on
indicator" is lit. ("72 " should be indicated after a while. )
Check whether the Burner On Indicator is lit by the Dum my Flame*.
Sh own
Fully close the gas supply valve.
With the Remote Controller turned on (if connected) and open the hot water xture. The unit starts sparking, and then connect the Dummy
Flame between CN78 Blue 1 - CN101 Green 1 (earth). Check whether "Burner On Indicator" is lit. ("72" should be indicated after a while.)
Current: DC 1µA or more
In many cases, the error code 11 for ignition failure does not reappear. In some cases the error is caused by
environmental factors (time, humidity, etc.). If the error does not reappear, also check the items listed belo w.
Item Check contents
Low primary pressure
Gas supply
The Primary Gas Solenoid
The Gas Solenoid Val ve-1 (SV1)
Ignition device Igniter
(faulty spark)
Ignition Plug
Faulty the manifold gas pressure setting
Control and
settings
Flame Rod
Gas Proportioning Valve
Other
Wiring
* Check the primary pressure (dynamic pressure) at the time of maximum combustion.
c i t a r o s i t i l b t y e h D u m m y F a l m * e
my Flame is shown in page 2.
* my Flame is shown in page 2.
Circuit Board
14
13
12 BL
11 W
10 R
9 Y
3 R
8
Main
7
6 BK Circuit
2 BL
5 BK
Board
4 W
3 W
1 G
2
BK
1 W
<CN63>
1 2 3
<CN135>
<CN101>
<CN78>
2
1
1 BL 2
3 BL
4 R
5
W
6 O
7 GY
8 BK <CN10>
2
9
10 W
<CN89B>
1 BL 11 BL
12
6 BK 13 W
14
5 R
15 BL
4
3
<CN78>
2 W
1 W
<CN42>
<CN89A>
Fluctuation factors and check procedure
Check whether the gas supply valve is half open.
Check the primary pressure (dynamic pressure) at the time of maximum combustion.
Check whether the error occurs when there is high gas consumption. (The primary gas
pressure (dynamic pressure) ma
Check whether the cabl e was caught between the front co ver and the casing or not.
Va lve (SV0)
Check for faulty insertion of wiring from Igniter to the Ignition Plug.
Check for water on or traces of water on the Ignition Plug.
Chec k whether the mani fold gas pressure can be adjusted and readjust the manifold gas pressure .
C h e k c w h e h t e
"the leakage occurred" or not. Check f or looseness or f aulty connection of grounding screw.
Pr es s the Ma ximum and Minimum Mani fold Pressure Set Bu tton and chec k that the
manifold gas pressure sw itches smoothly.
Faulty connection due to looseness of connector pins or incomplete insertion of connectors .
Check whether the cable was caught between the front cover and the casing.
39
Abnormal
Check the gas supply valve, etc.
Adjust the mani fold gas pressure
Abnormal
and check the gas and model
type setting, etc.
a ( . t t e h F a l m e o R ) . d
Not shown
Not shown
(on the Circuit Board.)
12 W
11 Y
10 O
9 R
8
7
6 BK
5 V
4 G
3 O
2 Y
1 W
<CN59>
1
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>
3
2
1
<CN75>
3 2 1
BL/W R/ R G
<CN102>
C heck for the wi ring (Flame Rod, grounding wire, grounding screw etc.)
Replace the Flame Rod.
ring high usage.)
" r h t e g o r u n d n i g i w e r w s a c u a g t h b t e w
Primary gas pressure list
Gas group
LP NG
Pressure
Maximu m
inch H O 14.0 10.5
2
pressure
Standard
inch H O 11.0 7.0
2
pressure
Minimum
inch H O 8.0 4.0
2
pressure
Check for the Burner injector,
Fan Motor, Burner, clogging.
Replace the Circuit Board set.
* It is not necessary to replace the
Display Window Circuit Board.
Display Window
Fuse
Circuit Board
Data
Displ ay
W 3 1 W
BK 4 2 BK
<CN92>
Dip Switch
1 2 3 4
R BL BL BL
<CN142>
Burner On
Indicator
o
e e n h t f e o r n c t v o r e n a d h t e c s a n i g " r o