Error Code Displayed; Specification Of Dummy Flame; Error Code Diagnostic Flow Charts - Noritz NR501-OD Service Manual

No Error Code
The Set Temperature is not displayed on Display Window when electrical power is connected
1-1
Operation indicator does not light when turned on
1-2 The fan does not operate when hot water fixture is opened
1-3 Outlet water temperature incorrect

Error Code displayed

Error Code
Remote
Display Window
Controller
11 11
121, 122 12
14 14
161, 162, 163 16
20 20
29 29
301, 302 30
311, 312 31
321, 322, 323 32
331, 332 33
351, 352, 353, 354 35
51, 511 51
611, 612, 614 61
70
70#
Note1)
71# 71
Note1)
72 72
731 73
733
734
No Display 760
768 76
90 90
901
902
903
908
91 91
941, 942 94
99
99
C # C1 - C4
Note2)
CF# CF
Note3)
H# #
H#
Note4)
1 2
Note 1) # = 1, 2, 3, 4, 5, 6, 7, 8, 9
Note 2) = 1, 2, 3, 4
# = 1, 2, 3, 4, 5, 6, 7, 8, 9, A, b, C, d, E, F
Note 3) # = 1, 2, 3, 4, 5, 6, 7, 8, 9, A, b, C, d, E, F
Note 4) # = 0, 1, 2, 3, 4, 5, 6
1
# = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
2
It may be difficult to insert the test probes because of the retainer surrounding the connector pins on the Circuit Board.
You will need to use a steady hand.

Specification of Dummy Flame

Error
Ignition failure (Ignitial flame fault detection)
Flame Rod does not detect flame (Flame fault detection)
Overheat Prevention Device (Thermal Fuse) triggered
Abnormally high output temperature
High Limit Switch triggered
Condensate Container clogging
Thermistor-Air abnormality
Thermistor-Cold Water abnormality
Thermistor-Hot Water abnormality
Thermistor-Heat Exchanger abnormality
Thermistor-Exhaust abnormality
Failure of Gas Solenoid Valve (or Gas Solenoid Valve drive circuit abnormality)
Fan Motor abnormality
Circuit Board abnormality
Gas Solenoid Valve drive circuit abnormality
Circuit Board abnormality
Flame Rod circuit abnormality (Detection of flame when no flame is present)
Circuit Board setting abnormality (Improper maintenance writers settings)
Circuit Board setting abnormality (Dip Switch settings)
Circuit Board abnormality
Remote control transmission abnormality
Display Window transmission abnormality
Air flow abnormality (Unit shuts off)
Combustion abnormality (Warning indication)
Combustion abnormality (Unit shuts off)
Combustion abnormality (Unit shuts off)
Combustion abnormality (Unit shuts off)
Combustion abnormality (Unit is locked)
Improper gas type
Exhaust temperature is too high
Combustion abnormality (Unit is locked)
Detect Scale Build-up in the Heat Exchanger
(Warning indication, and then Unit shuts off)
Detect Scale Build-up in the Heat Exchanger
(Unit is locked)
Detect Scale Build-up in the Heat Exchanger
1
(Warning indication after reconnecting electrical power for ten seconds)
2 Diodes
(Glass tube diode of
high frequency or signal)
Description
Resistance
(5M )
Switch
31
Page
32
33
35
Page
37
40
40
41
41
42
42
43
43
44
44
45
46
47
47
47
47
48
48
49
50
52
52
52
53
55
Flame Rod
Lead