I have an odd situation with my furnace.I am sorry to begin with that i dont have much info on make and model but maybe i can get some more possibilities from the info i provide.The thermostat is a at...
But first a question What is the make and model of your CONVERTER, and where is it located. IN many RV's (not all) the Converter is part of the Power Distribution Panel Assembly.
IS the Buzzing coming from near the converter?
The guess Furnace is THE biggest 12 volt load in most RV's (Some it is one of 2 or 3, Macerator Toilet, and 12 volt Absorption Fridge are the other two)
When the Furnace kicks in some converters may "Buzz".
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