39
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.)
Shown
Sh own
Replace the Flame Rod.
Chec k whether the manifold gas pressure
and fan speed are normal.
Adjust the mani fold gas pressure
and check the gas and model
type setting, etc.
* Check the primary pressure (dynamic pressure) at the time of maximum combustion.
A
Check that combustion conditions are normal.
Chec k whether the primary gas pressure
(dynamic pressure) is normal.
*
my Flame is shown in page 2.
*
my Flame is shown in page 2.
Normal
Normal
Normal
Abnormal
Abnormal
Abnormal
Fluctuation factors and check procedure
Check contents
Item
Gas supply
Ignition device
(faulty spark)
Control and
settings
Other
Low primary pressure
Igniter
Ignition Plug
Check for faulty insertion of wiring from Igniter to the Ignition Plug.
Faulty the manifold gas pressure setting
Flame Rod
Wiring
Check for water on or traces of water on the Ignition Plug.
Check whether the cable was caught between the front co ver and the casing or not.
Replace the Circuit Board set.
Check the gas supply valve, etc.
r
o
”
g
n
i
s
a
c
e
h
t
d
n
a
r
e
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c
t
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f
e
h
t
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e
w
t
e
b
t
h
g
u
a
c
s
a
w
e
ri
w
g
n
i
d
n
u
o
r
g
e
h
t
“
r
e
h
t
e
h
w
k
c
e
h
C
“the leakage occurred” or not. Check for looseness or faulty connection of grounding screw.
Compare the data indicated on maintenance monitor # 10 and # 20.
Check for the Burner injector,
Fan Motor, Burner, clogging.
).
d
o
R
e
m
a
l
F
e
h
t
t
a
( .
*
e
m
a
l
F
y
m
m
u
D
e
h
t
y
b
t
il
s
i
r
o
t
a
c
i
d
n
i
n
o
r
e
n
r
u
B
e
h
t
r
e
h
t
e
h
w
k
c
e
h
C
Check whether the Burner On Indicator is lit by the Dummy Flame*.
(on the Circuit Board.)
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.)
Check for the wi ring (Flame Rod, grounding wire, grounding screw etc.)
The Primary Gas Solenoid Va lve (SV0)
The Gas Solenoid Val ve-1 (SV1)
Gas Proportioning Valve
Pr es s the Ma ximum and Minimum Manifold Pressure Set Bu tton and chec k that the
manifold gas pressure sw itches smoothly.
Chec k whether the mani fold gas pressure can be adjusted and readjust the manifold gas pressure.
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.
Pressure
Maximum
pressure
Standard
pressure
Minimum
pressure
Gas group
inch H
2
O
inch H
2
O
inch H
2
O
14.0
11.0
8.0
10.5
LP NG
7.0
4.0
Primary gas pressure list
Current: DC 1µA or more
WARNING
WARNING
* It is not necessary to replace the
Display Window Circuit Board.
Not shown
Not shown
In many cases, the error code 11 for ignition failure does not reappear. In some cases the error is caused by
o
environmental factors (time, humidity, etc.). If the error does not reappear, also check the items listed below.
2
1
BL
3
2
1
R
BL
G
<CN78>
<CN101>
Display Window
Circuit Board
Burner On
Indicator
Dip Switch
Data
Displ ay
1 2 3 4
R BL BL BL
<CN142>
14
13
12
11
10
9
8
7
6
5
4
3
2
1
12
11
10
9
8
7
6
5
4
3
2
1
3
2
1
W
Y
O
R
BK
V
G
O
Y
W
4
3
2
1
BL
BL
BL
R
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
3
4
5
6
7
4 3 2 1
BR Y BL R
R
O
Y
W
BL
R
W
O
GY
BK
W
BL
W
BL
2
1
BL/W
BK
BK 4 2
W
W
Fuse
3 1
R/R
G
3
2
1
BL
6
5
4
3
2
1
BK
R
W
W
3
2
1
R
BL
G
BL
W
R
Y
BK
BK
W
W
BK
W
<CN63>
<CN135>
<CN78>
<CN59>
<CN142>
<CN104>
<CN27>
<CN92>
<CN101>
<CN10>
<CN75>
<CN102>
<CN89A>
<CN89B>
<CN42>
Main
Circuit
Board
Po wer
Circuit
Board
Circuit Board
1 2 3
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
ring high usage.)
Summary of Contents for NRC661-DV
Page 17: ...NR501 OD NR662 OD Thermistor Cold Water Thermistor Hot Water Gas Proportioning Valve 17...
Page 19: ...19 5 Operation Flow Chart Water heating Shutdown procedure Ignition operation NR501 OD...
Page 20: ...Water heating Shutdown procedure Ignition operation 20 NR662 OD...
Page 71: ...located 71...