A Bread Dough always needs to hit hot oven to get the beautiful oven spring and bake evenly. If your oven is not pre-heated and is not the right temperature (too high or too low) then your pav bakes unevenly, remains under baked and you get Yeast smell in your bread. And even after following this precaution if you feel that the dough still smells yeasty then in that case you need to reduce the amount of yeast than what is called for in the recipe.