Circuit Board Abnormality; Gas Solenoid Valve Drive Circuit Abnormality; Flame Rod Circuit Abnormality - Noritz NR501-OD Service Manual
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Also See for NR501-OD:
- Installation manual (28 pages) ,
- Owner's manual (32 pages) ,
- Replacement (11 pages)
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Error Codes
Display
Remote
Window
Controller
Circuit Board abnormality
70
70
Disconnect the electrical power, then reconnect electrical power to the Unit to reset the system.
If the Circuit Board abnormality is continuous, replace the Circuit Board set.
* It is not necessary to replace the Display Window Circuit Board.
Error Codes
Display
Remote
Window
Controller
Gas Solenoid Valve drive circuit abnormality
71
71
Circuit Board abnormality
This error code is displayed due to failure on the circuit board (Gas Solenoid Valve drive circuit) or in the Gas Solenoid
Valve drive system's ground. The cause could be a welding issue on the Circuit Board. Basically, if this error occurs the
Circuit Board set should be replaced.
Error Codes
Display
Remote
Window
Controller
Flame Rod circuit abnormality
72
72
Disconnect the connector from the Flame Rod and to prevent grounding
the connecto r. And check whether "72" is di
Not displayed
Displayed
Error Codes
Display
Remote
Window
Controller
731
Circuit Board setting abnormality
73
733
(Improper maintenance writers settings and Dip Switch settings)
734
Circuit Board abnormality
Description
Description
Description
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Description
731 Improper maintenance writers setting
Check for improper setting of maintenance writers on Circuit Board.
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733 Dip Switch setting
Check the Dip Switch setting on the Display Window Circuit Board.
(ex. high el evation, vent length, etc.)
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on display Window.
734 Circuit Board abnomality
47
<Condition of occurrence for error code 72>
This is displayed if the Flame Rod detects
fore ignition.
Replace the Circuit Board set.
* It is not necessary to replace the
Displ ay Window Circuit Board.
Replace the Flame Rod .
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Troubleshooting
