There is a burning smell coming from the tumble dryer
1.
Clothing can get caught between the door seal and drum which can create a burning rubber smell and even smoke when the tumble dryer starts. Ensure the clothing is placed properly inside the drum.
2.
Check the lint filter and remove any build-up of fluff.
For more information, see the Cleaning the lint filter topic.
3.
Check the air intake shroud is not blocked.
For more information, see the Cleaning the air intake shroud topic.