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Sears 92 gas furnace noise when not in air handling mode

My 5 year old Sears gas furnace has a hum coming from the front panel of the blower compartment when the blower is not on. Is this normal.

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  • Anonymous Jan 10, 2009

    I have a Carrier perf93 gas furnace that is making a lound humming sound while on for heating the house (little sound when air conditioner is on) can't figure out how to muffle that sound. It was billed as one of their quieter machines but it is Loud!

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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

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