Can you post a picture? Is it the oven, grill or hob you refer to?
Is your hob a four gas burner?
On the electric heater there are a number of things. First check you have switched on the mains supply correctly and set the inner thermostat to 9 and the outer control ring to 2000. Give it a few minutes to see if the heater warms up before turning on the fan. Let us know how you get on.