Guys, I'm a newby so be kind!! We have almost finished installing our new kitchen (well, new to us!!) and we are trying to work out how the fan assisted oven works (installed by an electrician) and upon turning the dial to heat, signified by a fan sign, the fan spins but it makes a noise as though it is catching on something. The oven came with the kitchen and is in spot on condition. Can the fan be adjusted or will it need replacing or do we need to look for a new oven? Your advice would be much appreciated.