| Symbol | Meaning | Action Required | | :--- | :--- | :--- | | | Thermistor failure (sensor open) | Replace temperature sensor | | “E2” | Flame failure (gas models) | Check gas supply / igniter | | “E3” | Overheat protection tripped | Reset unit, check for scale | | “E4” | Flow sensor stuck | Clean inlet filter | | Flame Icon | Burner active | Normal operation | | Tap Icon | Water flow detected | Normal |
The temperature is often adjusted via the water flow rate . Increasing the flow typically lowers the temperature, while a slower flow allows the water to heat up more. xyfb water heater manual
The unit must be wall-mounted vertically. Ensure the inlet (cold) and outlet (hot) pipes are correctly oriented according to the arrows on the unit. 3. Operational Guide | Symbol | Meaning | Action Required |
The device is tiny—roughly the size of a large book—yet it demands a massive amount of power (3000W at 110V). This leads to a common "story" for many buyers: Amazon.com The Breaker Struggle Ensure the inlet (cold) and outlet (hot) pipes
Includes water/electricity isolation, leakage protection, and over-temperature automatic power-off.