Hi I am new here and am having trouble finding my filter in Payne pg8maa furnace located in the attic. Is anyone familiar with it? There is only one access door with no filter in it and that door has one of those little screw on openings. Is it supposed to be in there or do I just put filters in the bigger air duct openings that are throughout the house?
I am not in the business of any trade I give advice on. I have non-professional hvac experience + good knowledge of theory. Attempt repairs at your own risk. Never jump out safeties - especially pressure switches - on a furnace for testing with fuel supply on; use a meter. Do not troubleshoot with live line voltage present unless there's no alternative.