What does the auto mode button on my electric blanket do? Issy 24 November 2021 11:56 Updated Auto mode sets the body and feet heating zones to temperature setting 5, and the timer to 3 hours. Related articles How many heating settings are available on my electric blanket? What temperature setting should I choose if I want to use my electric blanket all night? What is the difference between a heated throw and an electric blanket? Comments 0 comments Article is closed for comments.