Here is a link to the furnace manual. Page 37 is a troubleshooting flow chart. This will help. If you are inclined to work on your furnace, Please educate yourself for safety sake. If you need further help please contact me or call a technician. getting replacement parts and not being a license contractor can be difficult. I can help with that as well. This is what I have done for 40 years.
thanks Leonard, and thanks everyone else!
the manual is with the furnace. The same one as you linked.
the trouble shooting chart inside the cover, that I was looking at is the same chart you referred to on page 37.
I almost certainly will bring in the furnace tech. I just had to do the preliminary inspection in case there was something obvious and easy to fix.
I may try bypassing the pressure switch. The manual isn’t very good at identifying what is what so I only think I may know what and where the pressure switch is.
I tried measuring the capacitance of the run capacitor. I don’t think I was successful. I see two main wires going to each end and two other wires going to each side. Again, I am not 100% sure that I found the run capacitor.
it sounds like the best plan is to bring in the furnace tech as it sounds like standard practice to have the furnace inspected, by a pro.