Burning smell = severe danger. Unplug immediately, don't use. Most common: accumulated lint burning in system, or drum belt rubbing on metal.
See if any of these signs match your device — each one increases the likelihood of this fault.
These are the causes we encounter while repairing Burning smell from dryer — ranked from most to least common.
Lint burning from heating element
Worn drum belt rubbing on metal
Burnt motor from overload
Burnt electrical wiring
Flammable item in clothes
Lint trapped in heating element
Any of the following = a danger signal — call now and don't try to fix it yourself.
On-site diagnosis, clear pricing before any work, and a documented 6-month warranty.