>>13662802The "MIC1" looks like a pressure sensor. When the HEPA filter (or carbon prefilter) gets clogged the pressure sensor senses the difference and triggers a light. I bet this board is on the inside of the unit (the sucking side). I also bet OP needs to take his meds.
Don't worry OP, we all took our meds too so that yours will also work Just like Covid vaccines.