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I have an e3eb020h furnace that, when I cut it on, the blower works fine, but I have a weird humming noise coming from the furnace unit. What could it be?

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  • Robert George Jr.
    Robert George Jr. Oct 20, 2013

    Removed left side panel and the noise is coming from behind the right side panel where the circuit breakers are. Not getting any substantial heat output either.

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  • 24 Answers

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

  • Robert George Jr.
    Robert George Jr. Oct 20, 2013

    The noise is coming from behind the panel door on left side where circuit breakers are mounted. Fan is normal, but there is no substantial heat coming from vents when unit is running.

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Posted on Jan 02, 2017

  • 124 Answers

SOURCE: Sears 92 gas furnace noise when not in air handling mode

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

kf4rwe
  • 25 Answers

SOURCE: Intertherm model e3eb020h electric furnace won't start just hums

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

co7196
  • 3433 Answers

SOURCE: AC unit turns on blower doesn't come on

The thermostat is the controller.

Posted on Jun 19, 2009

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Yes the R anc C need to be hooked to the transformer supplied with the unit. The primary 120v side needs to be hooked into the power coming into the furnace. this can easily be done were the L and N get hooked into your furnace or circuit board on the furnace. This will provide the contiuous power to the unit. Preferably you will hook this after the door switch of the furnace so that you will kill the power toit if you take the blower door off.
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