My problem was when the bottom oven was on but the top oven wasn't, the top oven was getting up to 150. The longer the oven was on, the higher the temperature in the top oven. I have just had a third engineer come to look at my oven. The first said it was a design fault the second changed the thermometer which made absolutely no difference. The third guy said that the thermostat dial which showed a light go off when the temperature was reached was not accurate. He used his multi meter temperature test made by Socket and See and said although the dial showed 140, the temperature was actually 74. The reason the dial light was going off was because it wasn't accurate if the oven wasn't on!! When he put the top oven on suddenly the temperature dial was correct. So I am left with a top oven that is too hot to warm plates and is clearly absorbing a lot of heat from the bottom oven. What a waste of heat. More insulation would sort the problem. He kept saying all ovens were like that. I've had many ovens and never had this problem. If you are buying a new build don't let them put a Hotpoint oven in.
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