My new Belling 600 DIS caravan oven is sending heat into the grill,making the grill..even though not on..as hot as the oven which is on.The grill door handle gets very hot/dangerous Also a fan comes when the oven is on,is it a fan oven?there is no reference to this in the instructions Has it been installed incorrectly by the caravan builder? It is like it is venting hot air from the oven upwards into the gril