Flame goes out on releasing the knob
What you see
The burner lights while the knob is held but goes out when released despite correct use.
Likely causes
An incorrectly seated cap, contamination or a flame-sensing/safety-system fault.
Safe to try
With gas off and the surface cool, check removable burner parts as the manual allows. Never hold the knob down with an improvised support.
Technician
A qualified technician checks flame quality, sensing and the safety valve.

