The flameout of self-preheating burners under high-temperature conditions can be caused by several factors. According to the provided information, here are some possible causes:

Gas supply issues: If the gas supply is unstable or the gas quality is problematic (such as containing impurities or moisture), this can cause the burner to automatically extinguish during use.

Burner system faults: A malfunction in the burner system is another significant reason for the automatic flameout of gas burners. Users should check if the burner is clogged with dirt and if the fan is functioning properly. If any issues are found, it is recommended to have a professional repair technician clean or replace the relevant parts.

Temperature control system faults: Issues with the temperature control system can also prevent the gas burner from working properly. Check the burner's display screen for any abnormal prompts. If the temperature control system is faulty, it is best to have a professional inspect and repair it.

 Internal blockages and power failures: If the internal pipes of the water heater are blocked, it can affect the normal flow of gas, leading to the burner flameout. Additionally, power failures, such as loose power sockets or broken power cords, can also cause the burner to malfunction.

Flame detection issues: For cases where the flame ignites but then goes out, it may be due to damaged or dirty flame detection electrodes, burnt-out burner controllers, damaged ionization current circuits, or incorrect positions of the ionization electrodes.

Unstable combustion state: Issues such as unstable gas pressure, damaged pressure reducing valves, unstable or faulty temperature control instruments, unstable fan pressure and flow, and damaged or dirty burner nozzles can all lead to an unstable combustion state, potentially causing flameout.

Solutions: To prevent and address the issue of high-temperature flameout in self-preheating burners, consider the following measures:

1.Check and adjust gas pressure: Ensure that the gas pressure is within the normal range to prevent flameout due to low pressure.

2. Check and adjust air pressure for combustion support: Ensure that the air pressure for combustion support is sufficient to maintain a stable combustion process.

3. Check the instrument air source pressure: Ensure that the instrument air source pressure is normal to ensure the proper functioning of the combustion control system.

4. Regularly maintain the fan: Regularly inspect and maintain the fan to ensure it operates normally and to prevent flameout due to fan failure.

5. Adjust burner load: Adjust the burner's design load based on actual combustion requirements to avoid flameout due to excessive load.

6. Adjust air-fuel ratio: Adjust the air-fuel ratio according to the needs of the combustion process to prevent flameout due to an excessively high air-fuel ratio.

7. Monitor gas composition: Regularly monitor the gas composition to ensure it remains stable and to prevent flameout due to significant fluctuations in composition.

8. Monitor external atmospheric pressure: Monitor the external atmospheric pressure to ensure it is within the normal range and to prevent flameout due to low atmospheric pressure.

To ensure the safe use of self-preheating burners, users should regularly maintain and inspect the equipment and follow the correct operating procedures to prevent accidents. For example, clean the equipment before ignition and after extinguishing, observe the combustion condition, open the induced fan or combustion aid fan first, then open the fuel gas valve, and close the fuel gas valve before closing the induced fan or combustion aid fan when stopping.

Internal blockages and power supply issues: If the internal pipes of the water heater are blocked, it can affect the normal flow of gas, leading to the burner's flameout. Additionally, power supply issues, such as loose power sockets or broken power cords, can also cause the burner to malfunction.