Please follow this checklist:
- Is there still gas?
- Can you see a spark?
- Does the side burner ignite with a lighter?
If the burner ignites with a lighter, it is not a technical problem.
At the top of the side burner there is a steel pin. If this pin is too far away from the side burner, ignition will not work. You can bend the pin yourself. The correct distance is 3-5mm.