I went through this exact thing a couple years ago...just worked it as long as i could before it stopped alltogether (4-6 weeks maybe but running to the basement everytime became a pain). IIRC it was something to do with the control board, but was no longer economically viable to repair or parts were no longer available, so we had to replace it....which turned out ok because of how highly efficient and truly just better the new one is.
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