The flashing heating indicator light is a hardware fault prompt, with the core cause being "abnormal hot tank temperature sensor (NTC)":

1. Fault Causes:

   - Sensor Open Circuit: The sensor line is disconnected, unable to transmit temperature signals;

   - Sensor Short Circuit: Internal sensor fault, abnormal signal;

   - Poor Contact: The connecting line between the sensor and mainboard is loose or oxidized.

2. User-operable Checks:

   - Disconnect the power, wait 10 seconds, then restore power, observe if the indicator light returns to normal (eliminate temporary signal interference);

   - If it still flashes after restart, confirm there is no obvious collision or water ingress on the unit (external force may cause sensor damage).

3. Professional Handling:

   - The temperature sensor is a precision electronic component. Do not disassemble or test by yourself (easy to cause secondary faults);

   - Call the official after-sales hotline, provide the model number and fault phenomenon, after-sales personnel will come to repair with special tools (usually replacing the sensor solves the problem).

Safety Tips:

- Prohibit the use of heating function during the fault period to avoid temperature out of control;

- Do not tap or vibrate the unit to prevent further damage to the sensor line.