Noritz NRC661-DV, Service Manual, Page: 22 / 78

Connect power
Water Servo-Main moves to
initial position setting
Initial check
normal
High Limit switch
abnormality
Gas Solenoid Valve
abnormality
Thermal Fuse
abnormality
Display Monitor
transmission abnormality
768 / 768
20 / 20
14 / 14
51, 511 / 51
Priority Lamp (Orange) lights
Disconnect power
Priority Lamp (Orange) turn OFF
Self-diagnosis
Normal combustion
possible
10 years or more
of use
Self-diagnosis
Normal combustion
possible
99 / 99
901 / 90
901 / 90
Self-diagnosis
Normal combustion
possible
Water Flow Sensor
detected > 0.5 GPM
Initial check
normal
Thermistor-Cold Water
open or shorted
Thermistor-Hot Water
abnormality
Thermistor-Hot Water
open or shorted
Condensate Container
clogging
29 / 29
311, 312 / 31
321, 322 / 32
323 / 32
Thermistor-Exhaust
open or shorted
Gas Solenoid Valve
drive circuit abnormality
Circuit Board
abnormality
Thermistor-Heat Exchanger
open or shorted
331, 332 / 33
351, 352 / 35
70* / 70
51, 511 / 51
Gas Solenoid Valve
abnormality
711, 712 / 71
Note 1) A number from 1 to 9 is displayed in *
Flame Rod circuit
abnormality (1 A or more)
72 / 72
< -DV model only>
* 1
Inlet water high
temperature chek
normal
Fan Motor turn ON
Fan speed
(target
611 / 61
Igniter sparks
Primary Gas Solenoid Valve opens
Gas Solenoid Valve - 1 opens
Gas Proportioning Valve
opens
Flame Rod
detects 1 A
Igniter stops sparking
Re-ignition
(8 times or less)
Primary Gas Solenoid Valve
closes
Gas Solenoid Valve - 1 closes
Gas Proportioning Valve
closes
11 / 11
Primary Gas Solenoid Valve
closes
Gas Solenoid Valve - 1 closes
Gas Solenoid Valve - 2 closes
Gas Solenoid Valve - 3 closes
Gas Proportioning Valve
closes
Extinction
(5 times or less)
High Limit Switch
normal
Re-ignition
(8 times or less)
Flame Rod
detects 1 A
122 / 12
121 / 12
20 / 20
Burner On Indicator lit
Igniter stops sparking
Gas Solenoid Valve - 1
opens or closes
(as necessary) * 2
Gas Solenoid Valve - 2
opens or closes
(as necessary) * 2
Gas Solenoid Valve - 3
opens or closes
(as necessary) * 2
At max. BTU is
outlet water temp. less
than setting
Water Servo-Main
activates
Proportional control
(gas and fan)
Safety device
triggered
Igniter stops sparking
normal
90 / 90
Flame Rod does not
(0.5 A or less)
Outlet water temp.
is too high
Thermistor-Cold Water
open or shorted
Thermistor-Heat
Exchanger
open or shorted
Fan speed
abnormality
Exhaust temperature
is too high
Overheat prevention
device (thermal fuse)
triggered (363
Condensate Container
clogging
Thermistor-Hot Water
open or shorted
Thermistor-Exhaust
open or shorted
Abnormal combustion
Usage time is
equivalent to
more than 10 years
14 / 14
16* / 16
29 / 29
311, 312 / 31
321, 322 / 32
331, 332 / 33
353, 354 / 35
61* / 61 90* / 90
941, 942 / 94
99 / 99
Primary Gas Solenoid Valve
closes
Gas Solenoid Valve - 1 closes
Gas Solenoid Valve - 2 closes
Gas Solenoid Valve - 3 closes
Gas Proportioning Valve
closes
Note 2) A number from 1 to 3 is displayed in *
Note 1)
Note 2)
Note 2)
If the inlet water temp. is
less than 125 F or if the
following statements about
K are true, the inlet water
temp. will be normal (YES)
r e t a w t e l n i . p m e t ( ) F
l a t o T r e t a w w o lf
. x o r p p A 1 . 6 2
K o + >
Set temp. 125
K 136 Set temp. + 18
*1
*2
Gas Solenoid
Valve - 2
ON
Gas Solenoid
Valve - 3
ON ON
ON ON
Gas Solenoid
Valve - 1
ON ON ON ON
Over
87,200
BTU
Over
53,500
BTU
Over
36,000
BTU
Over
21,000
BTU
Over
15,000
BTU
A / B
< When using a Optional Remote Controller >
< When using a Optional Remote
ontroller >
A : Displayed on Display Window.
B : Displayed on Optional Remote Controller.
<SV conversion : 2 times or less>
<SV conversion : 2 times or less>
13
14
15
18
10
10
16
15
17
1
9
9
7
6
5
5
4
20
19
1
19
5
20
4
5
6
7
12
11
7
4
3
Note 3) A number 1 or 2 or 4 is displayed in *
Water Servo-Main
Closes
Gas Proportioning Valve
drive circuit abnormality
713 / 71
12
2
Water Servo-Main
Closes
Ignition operation
Shutdown
sensor detects
< 0.4 GPM
Primary Gas Solenoid Valve
closes
Gas Solenoid Valve - 1 closes
Gas Solenoid Valve - 2 closes
Gas Solenoid Valve - 3 closes
Gas Proportioning Valve
closes
Fan motor stops
Has 49sec.
passed since hot water
Water Servo-Main
activates to mid position
Less than 125
2
2
The unit is locked
The unit is locked
Gas Solenoid - Valve
Abnormality
711 / 71
Note 3)
Warning indication
2
Fan Motor turn ON
Fan speed
(target
611 / 61
Igniter sparks
Primary Gas Solenoid Valve opens
Gas Solenoid Valve - 1 opens
Gas Proportioning Valve
opens
normal
90 / 90
13
14
15
18
11
12
Ignition operation
Fan motor stops
908 / 90 The unit is locked
908 / 90
The unit is locked
22
<NRC661 (-DV, -OD)>