Can you post the model number please.
model number is ISL5SS
Ok thanks for that.
There is a fuse on the control board but as the fan is working I don't think the fuse will be the cause of the problem as if that fuse is faulty im pretty sure it cuts the complete hood out.
To access the board you need to remove the filters an look under there. There you should see the board under there.
If its not there then you need to remove the chimney section at the top of the hood and the board is there. As some models the board is in the chimney section and others its behind the filters.
Check that board and see if theres any signs of burning on there. If that's ok then its usually the transformer in there that stops the lights from working.
Check the wiring as if there was a leak it could have dripped onto the transformer and burnt it out.
Check them and see what you find. But I think you may find the transformer could be the cause of this.