: Lights up when the water temperature is set to 50°C or higher as a burn hazard warning.

Always check the water temperature with your hand before stepping into the shower, especially if the temperature was recently adjusted by another user.

: Press the Priority Button on the bathroom remote (II) to take control. Pressing it again can transfer control back to the kitchen remote.

Many modern TGC water heaters paired with the BC-90-1H include an energy-saving suite designed to reduce resource consumption. Environmental (Eco) Mode

To prevent energy waste, most modes feature a customizable timer: Turn on your desired mode (e.g., Heating).

The TGC BC901H manual also covers advanced features and functions, including:

✅ Safely install and wire the device. ✅ Program daily and weekly schedules. ✅ Troubleshoot common errors (E1, E2, E5). ✅ Access advanced parameters for fine-tuning. ✅ Perform maintenance and (if applicable) firmware updates.

Check if your main gas valve and meter are completely open. Turn off the tap, wait 10 seconds, and try again. Flameout / Flame Interruption

: Check if the main power supply or circuit breaker has tripped. Maintenance Tips

If the water heater has been in standby mode for more than 10 minutes, the priority is automatically released, and the indicator lights will go out. The system will remember the last set temperature when it is used again. Installation and Maintenance

| Error Code | Meaning | Solution | | :--- | :--- | :--- | | | Reverse polarity | Swap the clamps. Red to positive, black to negative. | | Err 02 | Battery voltage too low (< 2V) | Battery may be dead; attempt a bypass or replace battery. | | Err 03 | Short circuit | Check for bare wires touching. Unplug and inspect cables. | | Err 04 | Over-temperature | Let the unit cool for 30 minutes. Clear vents. | | Err 05 | Battery voltage too high | Check if you selected the wrong voltage (e.g., 12V battery on 24V setting). | | F01 | Internal fuse blown | Replace fuse (see manual for rating) or return for service. |

The TGC BC901H is a classic example of a budget audio product. If you get a functioning unit, it can provide satisfactory sound for casual listening at a low cost. However, the high frequency of reported defects, particularly regarding battery life, connection stability, and physical fragility, makes it a risky purchase.