Grill tripping the house circuit breaker?

Hi
Since Xmas the grill on my Belling dual fuel cooker has been tripping the house circuit breaker. So obviously I have not been using it. Today, we replaced the grill element with a sparkling new one, but horror!! It tripped again straight away.
The grill has a cooling fan associaited with it as well as the usual control knob.
Can anyone suggest what the problem is please?