I ran across an old Cadet model FX-102 in wall heater during a recent inspection. This is an older model of the Cadet brand heaters and is no longer produced due to safety issues. There was a now expired safety recall campaign by Cadet a few years ago where the majority of the units were replaced.
If you have a Cadet brand in wall heater it is a good idea to check the model number against the recalled unit list that is still on the Cadet website. The recall is over for getting a new unit from Cadet but you still need to replace any of the affected models if they happen to be in your house.
Houses heated by electricity often have a mix of electric baseboard and in wall heaters. When in wall heaters are present, there is often a blackish discoloration or "sooting" on the heater grill and surrounding wall.
Look at the heater grill cover and you will often see this condition present. This discoloration is caused by lint and debris on the grill and heating element. This build up results in excess heat being retained and will eventually cause the "sooting" condition.
Brian Jovag, owner of Jovag Home Inspection.