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All, it was a short in the 24v wire between the airhandler and the outside compressor unit.

I have a 14 YO Lennox builder grade 2 ton system. The orig. transformer blew about 1 year ago, I replaced it (with help from this board) and 6 months later it blew again. This time, I installed a...

Update. I ordered the exact transformer part from HvacPartsShop.com for $26. I highly recommend these guys - great transaction. I put the transformer in and the furnace works great - house is now...

Hello, I've made progress! The meter reading on the low side of the transformer was 0. Just to be sure, I went to my other Lennox furnace and 'borrowed' it's transformer. I temporarily installed it...

Hello. There is no door switch, the cover attaches t the furnace with 2 screws. I do own a meter but don't really know how to use it and am a little bit of a chicken. I found one red reset button...

I have a circa 1996 lennox 3 ton residential unit (80mgf2-45a-5). I went to turn on the heat and nothing happened. I tried the A/C and same. I replaced the digital thermostat with a round honeywell...