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Jessica SmithAug 7, 2025
What to do if my Navien Boiler displays error E787?
- MMelissa AnthonyAug 7, 2025
For error code E787 on your Navien Boiler, the suggested solution is manual intervention or a power reset.
To Next PageTo Next PageWhat to do if my Navien Boiler displays error E787?
For error code E787 on your Navien Boiler, the suggested solution is manual intervention or a power reset.
What should I do if my Navien Boiler shows error code E047?
For error code E047 on your Navien Boiler, the suggested solutions are manual intervention or automatic correction.
How to fix error E788 on Navien NCB300-28K Boiler?
For error code E788 on your Navien Boiler, the suggested solution is manual intervention.
How to fix E004 error on Navien NCB300-28K?
The suggested solution for error code E004 on your Navien Boiler is automatic correction.
What to do if Navien NCB300-28K displays error E046?
The suggested solution for error code E046 on your Navien Boiler is automatic correction.
General| Type | Combi Boiler |
|---|---|
| Efficiency | 95% |
| Weight | 79 lbs |
| Warranty | 15 years heat exchanger, 5 years parts |
| ENERGY STAR Certified | Yes |
| Fuel Type | Natural Gas/LPG |
| DHW Capacity | 199, 000 BTU/h |
| Max. DHW Input (NG/LP) | 199, 000 BTU/h |
Defines safety symbols (DANGER, WARNING, CAUTION) and gas leak procedures.
Precautions against flammable liquids, combustibles, and proper boiler operation.
Safety instructions for preventing burns from hot water and boiler temperature settings.
Cautions regarding piping, bypass valves, and general installation practices.
Details responsibilities, checklist, and code of practice for boiler installation.
Instructions for responsible disposal of the boiler and its components.
Lists components provided with the boiler and available optional accessories.
Detailed performance and technical specifications for boiler models.
Identifies key internal parts of the boiler through diagrams.
Provides physical dimensions and supply connection details for the boiler.
Details central heating, DHW, and outdoor temperature operating modes.
Requirements for boiler placement, utilities, clearances, and drainage.
Step-by-step instructions and safety precautions for wall mounting.
Guidelines and recommendations for connecting the central heating system.
Instructions and considerations for installing the DHW system.
Procedures for routing and connecting the condensate drain line.
Recommended pipe sizes and water pressure requirements for the system.
Specifications and installation guidelines for the pressure relief valve.
Steps to properly fill the boiler and heating system with water.
Requirements for gas pipe materials and propane (LPG) installation.
Procedure for checking the boiler's inlet gas pressure.
Guidelines for flue terminal placement and required clearances.
Step-by-step instructions for installing the flue system.
Calculating flue length and accounting for elbow resistance.
Final steps and cautions for flue termination.
Steps to access terminal strips and connect power supply cables.
Wiring instructions for the 230V switched live connection.
Wiring instructions for connecting room thermostats or OpenTherm devices.
Instructions for connecting an optional outdoor temperature sensor.
Details on the OpenTherm® modulating control interface.
Instructions for connecting Navien Smart Room and Room Controllers.
Guide to understanding front panel icons, digital display, and buttons.
Procedure for powering the boiler on and off.
Steps to adjust the central heating supply water temperature.
Steps to adjust the domestic hot water (DHW) temperature.
Procedure for resetting the boiler and setting CH heat demand.
Navigating basic menu items for viewing information and settings.
Accessing and setting advanced operation parameters.
List of error codes, their definitions, and possible remedies.
Instructions for cleaning the boiler exterior and draining water.
Maintenance of the return adapter filter and freeze protection function.
Guidelines for interim servicing, general checks, and full service.
Procedures for measuring CO and CO2 levels for safe combustion.
Step-by-step guide for converting the boiler from Natural Gas to LPG.
Electrical schematics and control logic diagrams for the boiler.
Guidelines for installing the optional outdoor temperature sensor.
Information and documentation requirements for boiler warranty validation.
