When electricity moves through the insulated heating coils that are sewn in the interior of an electric blanket, heat is produced and regulated by a controller.
By following the manufacturer's safety and use guidelines, it is unlikely that you will have any problem with your electric blanket.
If your electric blanket or pad gets wet, do not turn it on until it is dry. Never use these products on a water bed. Never wash an electric blanket in a washing machine.
Lay your blanket flat on the bed, not folded over, and do not tuck in the ends under the mattress. The Electric Blanket Institute cautions against using heated bedding on Murphy beds, sofa beds, recliners or any surface that folds up. Turn off the blanket when you are not using it.
Each year, examine your blanket for exposed wires, and check the cord for damage before plugging it in.