My Harman Accentra pellet stove stopped working a few weeks ago. Using the manual and doing some diagnostics I discovered a possible issue with the control board, which I replaced. I set the dip setting the same as old board and settings seemed to agree with sheet that came with new board. Now I get the status light which blinks twice. That trouble code was not in in the manual (had the rest of trouble codes in manual), but found online which indicates an air flow/pressure switch issue. To be on the safe side I went ahead and replaced the switch. Since then I have tried activating the switch manually (sucking/blowing on tubing to switch) and even bypassed switch. I still get trouble code on the status light of two blinks. I'm kinda at a loss of where to process from here.