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Buzzing plenum heater

We have a plenum heater that periodically makes a VERY LOUD buzzing noise (lasts from 15-60+ seconds). It happens when the furnace comes on and seems as though a switch is getting stuck. It will continue to have a low buzzing noise for several minutes. Any ideas?

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Is the fan relay going bad it is located normally inside control box behind panel where wiring enters unit

Posted on Jan 04, 2009

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Write me back here or allexperts.com or wbwill@sbcglobal.net.

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