It's almost certainly a bad humidity sensor or "gas sensor" as they also call it.
There may be a "mini-manual" hidden inside the unit behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting & testing.
You can order Samsung parts here.
You can find your nearest Samsung-authorized service center here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
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