Burner Control Knob

One of my burner control knobs does not turn. I can push it down, but it will not turn. Do I need a new burner valve? What would a technician charge to replace this? Thanks

Hi.

Most likely you do need a new burner valve. Don’t force it, if you brake it there will be gas leak.
Check the price with you local repair companies.

Thank you.

Simon.