Buzzing furnace sound
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Wuzzat?
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On the chance that it is a loose lamination, find one of these
[ame]http://www.google.com/search?client=safari&rls=en&q=transformer&oe=UTF-8&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=BXANUY6QCIa_0AGT9oCoAg&biw=1020&bih=764&sei=CXANUd3qNKKa0QHIs4HgDQ#um=1&hl=en&safe=off&client=safari&tbo=d&rls=en&tbm=isch&sa=1&q=transformer+hvac&oq=transformer+hvac&gs_l=img.3..0i24.5498.7931.0.8306.11.6.3.2.2.0.64.277.6.6.0...0.0...1c.1.2.img.J9KPFKupsPk&bav=on.2,or.r_gc.r_pw.r_qf.&bvm=bv.41867550,d.dmQ&fp=90fa3f9b99639e9d&biw=1020&bih=764&imgrc=rqHLw3c4VvxFpM%3A%3BSQu_Vu9qttqu7M%3Bhttp%253A%252F%252Fhvac-parts-online.com%252Fimages%252FAT87A1189_Transformer.jpg%3Bhttp%253A%252F%252Fhvac-parts-online.com%252Findex.php%253Fmain_page%253Dindex%2526cPath%253D82289_82302%3B318%3B293[/ame]
in your furnace and press on it.
Relays can also buzz but pressing on them is a bit tricky.
With a helper you can also use an empty garden hose as a stethoscope but the metal panels in furnaces can act as diaphragms and so you might do better pressing on things.
The buzz frequency may give a clue; YouTube has various sounds of various frequencies that you can use to compare.
[ame]http://www.google.com/search?client=safari&rls=en&q=transformer&oe=UTF-8&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=BXANUY6QCIa_0AGT9oCoAg&biw=1020&bih=764&sei=CXANUd3qNKKa0QHIs4HgDQ#um=1&hl=en&safe=off&client=safari&tbo=d&rls=en&tbm=isch&sa=1&q=transformer+hvac&oq=transformer+hvac&gs_l=img.3..0i24.5498.7931.0.8306.11.6.3.2.2.0.64.277.6.6.0...0.0...1c.1.2.img.J9KPFKupsPk&bav=on.2,or.r_gc.r_pw.r_qf.&bvm=bv.41867550,d.dmQ&fp=90fa3f9b99639e9d&biw=1020&bih=764&imgrc=rqHLw3c4VvxFpM%3A%3BSQu_Vu9qttqu7M%3Bhttp%253A%252F%252Fhvac-parts-online.com%252Fimages%252FAT87A1189_Transformer.jpg%3Bhttp%253A%252F%252Fhvac-parts-online.com%252Findex.php%253Fmain_page%253Dindex%2526cPath%253D82289_82302%3B318%3B293[/ame]
in your furnace and press on it.
Relays can also buzz but pressing on them is a bit tricky.
With a helper you can also use an empty garden hose as a stethoscope but the metal panels in furnaces can act as diaphragms and so you might do better pressing on things.
The buzz frequency may give a clue; YouTube has various sounds of various frequencies that you can use to compare.
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