Question about Ruud Heating & Cooling
Humming could be a body panel or metal to metal point that came loose and just needs secured in the furnace or ductwork. could be an electrical issue that you may or may not be able to find with the doors off and trying to locate where the hum is coming from. it may go away when a panel is removed because it night be air sucking through a loose section of the door. the question is vague but I would press around while its running to see if it subsides. as always when its running with the panels off electric shock hazard and arc flash can occur causing bodily injury or death that's why they have the door switch which will cause the unit not to work with the door off. you can tape this switch to test the furnace but be very aware it is done on your own and I cant tell you it is ok to do this if you have no knowledge of electricity and its dangers. this is only for you to possibly find a hum and not press around on electrical components.
Posted on Oct 20, 2013
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Posted on Jan 02, 2017
a very subtle hum or buzz is normal and is the transformer that creates 24 volt control voltage continually. some are noisier than others . sometimes a tap or bending of the transformer will tweak the metal enough to make it quieter. they can also get loud if incoming voltage is not correct. incoming 120 volts on a furnace is not usually a problem but the transformers are usually wired to the available incoming 230 voltage or 208 voltage if it is a heat pump or electric heat. If it is powered by 230 or 208 volts as most heat pumps are ,then you need to verify which you have and connect the appropriate leads from the trans former to power . it tells you on the side of the transformer which to connect to 230 and which to connect to 208. tape or cap off any unused leads.since you have not mentioned any performance problems i assume the fan does come on when called for and that it is not the loud hum you hear. switching the fan switch at stat to on should bring the fan on right away. if it doesn't then you may hear a loud hum and then youll need to check the fan motor and capacitor. but it sounds like a noisey transformer from here.
Posted on Oct 28, 2008
Check fuses. one may be blown, and the other one not, Therefore you are getting only 110V to a 220v circuit.
Posted on Dec 03, 2008
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