When I get old they break simple as that ,anything older than 10 years old you are on borrowed time I got lucky and got into my new house without my old system breaking down it was 18 years old but I am a maintenance nut with everything I own and try to get the most I canI service my unit myself every year with a total cleaning outside units and inside. Did everything. Put new capacitor in last week. Unit is totally frozen up. Must have Freon leak somewhere. I have some R-22 and gauges from five years ago when I serviced it and it worked GREAT really cold and really hot. We use Heat Pumps in the South. I am going to put some more Freon in this morning and also call to get a NEW TRANE put in. Sucks, Probably going to cost about $12K, but it 14 years old and time for an update. Just wish that it wasn't in the 90s until we get a new one.