Need help... Ruud Furnace Model UGAC-O6KC (0orO) Serial TN3D104 F2083 6467 electric ignition, when I watch it, it clicks, the ignitor does not light the pilot. I manually light the pilot, after about 30 seconds, the pilot clicks and goes out. about 15 seconds later it click again but does...

It can go weeks without tripping...but once it starts it seems to happen more often. As the days get hotter and more often it trips more often. I will try to explain more. It's an outdoor Air Conditioning RUDD unit. The house is 1100 sq ft. Heater and Stove is propane. No dishwasher...