I have a knight high efficiency boiler that is in its fourth winter. The first winter it started making noises like a wounded elk. Most often during the coldst part of the day. We had the installer out several times and they said it was fine. No noiSe when they were here. The next winter the same thing only This time something was cleaned internally and a board of some kind was replaced. All well the rest of the winter. Good all third winter. This winter the elk is back worse than ever. Wakes me up thre or four times a night. Neighbors even complain about the noise. Any ideas?
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