Lennox P-8-9490 Transformer Burned Out
check the wires to the outdoor unit. may be damaged from weed whacker, dog chewing, brittle and insulation missing and shorting.
also I would splice a 3 or 5 amp GM auto type fuse with blade terminals into the wire from the trans/secondary low voltage side so the fuse pops while you are short searching. can attach the wire to the fuse with spade type stakons from radio shack or the auto parts store.
"Cut it twice and it is still too short".
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