Appliance Repair Questions? Ask a Technician for Answers ASAP
Hi Mike . The gas pipe may be undersized or blocked . also the hob may have the wrong jets, LPG and natural gas are different . Get a gas safe engineer to check as a yellow flame means it is incomplete combustion and making carbon monoxide, a deadly gas with no smell .the symptoms are flue like symptoms, headaches etc. Don't mean to worry you but don't use it until it is investigated properly.