Why does the sole of the left foot feel numb and slightly painful in winter?

This situation is common for many reasons:

1. The water-gas linkage valve fails, and there is a linkage rod at the joint between the water valve and the air valve (the function is to push the switch of the second air valve by the pressure of water). At first, the water film of the water valve may work normally, but after a while, the water film failed to return, and the linkage rod closed the second air valve, which led to the stop of gas supply and flameout. The main reasons are long service life, aging of water valve and possible cold weather.

2. Unexpected flameout. There are many reasons for this situation (common phenomena include unqualified burner, flame separation and tempering, induction needle can't sense flame, unstable power supply, accidental valve loss of gas solenoid valve, etc.). )

3. Your home is located on the high floor and installed outdoors. The wind was so strong that it blew out the flames. The induction needle of the water heater can't sense the flame and automatically stops. This is a safety function of gas water heater, and it is possible.

4. It may be that there is insufficient electricity (only one flue water heater with battery), and the gas solenoid valve on the reverse water gas linkage valve has insufficient current, which leads to the unexpected closure. Try replacing the battery as a solution.

5. If it is a forced water heater, it may be that the fan is unqualified or the smoke pipe is blocked, which leads to the unstable speed of the fan, and the negative pressure generated by the fan fluctuates too much, which leads to the unstable negative pressure received by the wind pressure switch, thus drawing the conclusion that the machine is stopped or the ignition is not started.