Sealine S25 Cooker

You have a faulty regulator or blocked airation. A yellow flame signifies carbon monoxide which as has been stated is not good. Easily remedied but needs sorting asap.
 
As already stated , yellow flame means the gas is not burning properly , and is producing carbon monoxide . It's not just not good though . Carbon monoxide kills , you need to get it sorted urgently , and until you do , always have plenty lots of ventilation
 
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