The Icelandic international fired low past Robert Sanchez in the 53rd minute to cancel out Lewis Dunk's opener in the first half.
The winger scored his first goal since August 2019 when jumping on the rebound after Erik Pieters' effort was kept out.
Burnley dominated, clocking up 20 shots on goal, but couldn't find a deserved winner.
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Burnley dominated, clocking up 20 shots on goal, but couldn't find a deserved winner.