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My name is Mark from NJ and I am a DYIer. I just posted a question in the HVAC section had hope to find help from those who know.

I have an older furnance with a Honeywell RA 89a 1074 switching transformer that has a loud hum at times at other times a low hum When I hear the loud hum the system still works and if I turn off the power switch and turn it back on , the hum changes most the time. It will usually get...