HI MY MUM TOOK DELIVERY OF THIS COOKER ON MONDAY.WE GOT A GAS SAFE FITTER IN TO CONNECT TO THE MAIN GAS SUPPLY,PUTTING A NEW HOSE ON AND EVERYTHING HAS BEEN CONNECTED UP CORRECTLY.WE BURNT OF THE FACTORY RESIDUE ETC,BUT EVEN THOUGH THE SUPPLY FROM THE METER IS CORRECT THE COOKER IS NOT...