Hi-i have a Lennox A/C and Heating split system unit which had the capacitor replaced 4 weeks ago because the unit would turn on but without the fan and would blow the circuits. It worked fine until yesterday and now the fan will not turn on again. Today a tech came out from a different company than the one who replaced the capacitor, and confirmed that it was bad. He also mentioned that it was a 50-and he'd not seen one that large on a unit like mine. The furnace is model G40UH-60C-110X-03 and the condensing unit is model 12ACB48-5P. Was the capacitor the correct size for my unit? I will need to call the company who installed it to have it replaced. I don't think I should be charged, but could something else cause the capacitor to go bad so quickly?