The working principle of the ceramic ignition needle (with gas leakage protection device): press the valve body knob, the ignition needle starts to discharge and ignite --- and then turn the knob to connect the gas to discharge gas from the stove. To burn, press and hold the knob for a few seconds, let the thermocouple (that is, another column similar to the ignition needle, usually copper) heat up to a certain temperature (usually do not let go and wait for 3-5 seconds, this time if Let go, the thermocouple does not reach the rated temperature, the solenoid valve will not pull in, and once you let go, the gas will be cut off, and the stove will be off), so that the solenoid valve inside the stove can be pulled in, and the gas can be continuously passed to the stove for a continuous period of time. Burning, there are 4 reasons for letting go and turning off the flame:





1. There is a problem with the thermocouple;
2. There is a problem with the solenoid valve;
3. There is a problem with the valve body;
4. There is a problem with the power cable between the three.
 
Generally, 1, 2, and especially 3 are not easily broken, and according to the reasons you said, it can be judged: there should be a problem with the thermocouple or solenoid valve on the right, which requires specific inspection to know.
 
Another method you can try is to pull out the knob on the right, and rub some paper balls or the like between the knob and the knob rod to increase the distance between the knob and the cooktop. This approach is because sometimes the knob If you can't press it to the end, you will also lose your hand. If it doesn't work, you can press the knob and shake it after the fire is on to see how it goes. If these two methods can't solve the problem, it means that the valve body of the cooker is good (on the contrary, there is a problem with the knob or valve body of the valve body)! All that's left is the solenoid valve and thermocouple!