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Guidelines for safe and proper service procedures, including protective gear and tool usage.
Detailed wiring diagram for NR501-OD and NR662-OD models.
Block diagram of the circuit board connections.
Detailed wiring diagram for NRC661 models.
Detailed wiring diagram for NRC711 models.
List of error codes, descriptions, diagnosis points, and remarks.
Table of normal values for checking circuit board components.
Troubleshooting steps for issues without specific error codes.
Troubleshooting steps for ignition failure error code 11.
Troubleshooting for flame detection errors 121 and 122.
Troubleshooting for abnormally high output temperature errors.
Troubleshooting for gas solenoid valve failure errors.
Troubleshooting for fan motor abnormality errors.
Troubleshooting for circuit board and flame rod errors.
Troubleshooting for airflow and combustion abnormality errors.
Diagnosing and addressing water leaks potentially caused by scale build-up.
Troubleshooting steps when hot water is not delivered due to scale build-up.
Steps for transferring data from an old circuit board to a new one.
Measures to prevent freezing damage in normal and cold conditions.
Guidelines for safe and proper service procedures, including protective gear and tool usage.
Detailed wiring diagram for NR501-OD and NR662-OD models.
Block diagram of the circuit board connections.
Detailed wiring diagram for NRC661 models.
Detailed wiring diagram for NRC711 models.
List of error codes, descriptions, diagnosis points, and remarks.
Table of normal values for checking circuit board components.
Troubleshooting steps for issues without specific error codes.
Troubleshooting steps for ignition failure error code 11.
Troubleshooting for flame detection errors 121 and 122.
Troubleshooting for abnormally high output temperature errors.
Troubleshooting for gas solenoid valve failure errors.
Troubleshooting for fan motor abnormality errors.
Troubleshooting for circuit board and flame rod errors.
Troubleshooting for airflow and combustion abnormality errors.
Diagnosing and addressing water leaks potentially caused by scale build-up.
Troubleshooting steps when hot water is not delivered due to scale build-up.
Steps for transferring data from an old circuit board to a new one.
Measures to prevent freezing damage in normal and cold conditions.
General| Category | Water Heater |
|---|---|
| Type | Tankless |
| Fuel Type | Natural Gas |
| Heating Capacity | 6.6 GPM |
| Energy Factor | 0.82 |
| Vent Type | Direct Vent |
| GPM @ 35°F Rise | 6.6 GPM |
| Minimum BTU Input | 15, 000 BTU |
| Vent Diameter | 3 inches |
| Ignition Type | Electronic |
| Warranty | 12-Year Limited on Heat Exchanger, 5-Year Limited on Parts, 1-Year Limited on Labor |
