Performed diagnostic on 16yr old York unit, upon arrival customer stated unit wasn’t heating properly, stated it would run for a few minutes and shut down, checked tstst, already in heat mode, upon goin in attic unit was on and heating, noticed no flood protection, explained the importance of flood protection to stop ceiling damage from water back up, after running for about 8 min unit shut down and gave 4 flashes( high limit open), inspected furnace, checked heat exchanger see a lot of rust but no visible cracks, explained there could still be hairline cracks from all the rust, found blower wheel heavily impacted, recommend pulling and cleaning, also explained blower can still fail after cleaning, blower capacitor checked ok, inducer motor over amping 1.20/1.06, recommend replacing inducer motor , duct are heavily impacted, recommend duct cleaning, as well as indoor air quality such as apco x, spoke with customer about home care options, went over all repair options customer chose opt