There is a magnet on the underside of our Contura wood burning stove, as shown in the photo, which I accidentally moved recently when adjusting the air flow using the lever which is also shown in the photo. Neither the installation manual, nor a Google search have borne no fruit in telling me what this magnet is for and where it should sit. Can anyone shed any light on this please? The stove has been going out when lit of late which is unusual and I'm wondering if my having moved this magnet might be the cause of the problem.