before inspecting or repairing electrical parts.
Mark the wall anchor positions using the built-in mounting bracket as a template.
Water temperatures over 125°F (51°C) can cause severe burns instantly. Always test the water before bathing or showering.
Complete XYFB Water Heater Manual: Installation, Operation, and Troubleshooting
Press these keys to adjust your target water temperature. The system automatically regulates power output to hit your target.
Once the system is securely installed and filled with water, you can begin the startup process. Lighting Instructions (Gas Models)
Adhere to local codes and manufacturer instructions when installing or servicing the XYFB water heater. Regular maintenance—flushing, anode inspection, and testing safety devices—extends service life and ensures safe operation.
: Before turning on the power, open all hot water faucets in the house. Allow water to run through the heater for 2 to 3 minutes to purge all air pockets from the system. Operating the heating elements with air in the lines will burn them out instantly.
If your XY-FB isn't performing correctly, check these common points referenced in general tankless manuals: Water heater not heating reset button.
: Slightly reduce the flow of the hot water faucet. Lowering the volume of water moving through the unit gives the heating elements more time to transfer heat to the stream. Error Code E1 (Overheating Protection)
: Maintain at least 12 inches of clearance on all sides of the unit for proper ventilation and future maintenance access. Step-by-Step Installation Guide
The manual for the XY-FB series is effectively a guide to expectations. If you are looking for a whole-home solution, this manual will be the bearer of bad news; it explicitly states the unit is designed for single-point delivery .
Turn off the power. Let the water cool down completely. Check for low water flow or scaling inside the pipes that might trap heat. Restart the unit. Error Code E2: Sensor Failure
Turn off the main electrical power before modifying internal dials.
Do not store gasoline, solvents, or other flammable liquids near the water heater.
