Chris Rosales came after Nate’s Saturday call, Nate said it was a pressure switch, changed switch and unit still did not turn on. Checked fresh air and found it clogged , cleared flog and unit still did not turn on. Took fresh air apart and cleaned it, it is clear now however unit is still not turning on. Took 90 off air intake outside and unit is still not turning on. Derek to com back tomorrow.