I've got a problem where whenever I turn on the radiator in the bedroom a Mouldy/earthy smell fills the room.
A year ago I found a lot of black Mould behind a wardrobe on the opposite side of the room to the radiator (caused by condensation) which I have cleaned up, mould did reach across the wall towards the radiator wall but not much and did not reach the radiator.
Currently there is no Mould int he room, its ventilated regularly.
Its really boggling why the radiator is smelling when its turned on, could there be Mould behind the lining paper behind the radiator, is there old Mould spores stuck to the radiator that release smell when heated?