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Re: Sears 92 gas furnace noise when not in air handling...
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.
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The humming coming from the blower is probably your blower not operating. It may be a number of things.if you turn you AUTO-ON setting at your t-stat to the ON position, it should operate your blower (indoor) only. If that does not bring the blower on its probably not your t-stat. Check all your breakers, both at the indoor unit(if equipped you should be able to see them without removing any panels), and at your breaker panel. If a breaker is tripped, reset it and then AUTO to ON again at the t-stat. If no luck it may be the blower motor or any component that connects to the motor. Call a tech.
If it is an electric furnace, the heat sequencers usually take 45 seconds to possibly 1 1/2 minutes to fully stage on. This depends on how many elements you have. Of course, once they stage on, one or more elements COULD be burnt out.
If its a gas furnace over ten/twelve years old, the thermally activated control should start the blower at approximately 140 degrees. That usually occurs within one or two minutes of main gas opening.
If its a gas furnace that's relatively new, the blower comes on through a circuit board after a call for heat is initiated and could run and blow cold air even if the main gas flame is in flame failure.
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.
If its a high or mid efficiency furnace most of the time the sequence of operation goes as follows: tstat calls for heat (R&W at tstat ) ventor motor starts, pressure switch closes, spark or hsi lights pilot or main burners. main blower motor comes on. From your description of a humming noise it sounds like maybe the ventor motor is seized.
Can you please verify the furnace mode, nothing comes out with the BGU100168 model #. Is it an oil or gas furnace? Was it bought at Sears? In the mean time you can try cleaning the filter, with a piece of emery or sand paper sand clean the flame sensor (thermocouple) in front of the pilot light (if applicable). Reset the unit by disconnecting the power for 5 min. and tuning it back on. Keep me posted!!
Hello,1st check that the gas valve is on (the knob on top).2nd check that the gas handle is open in the gas pipe next to the unit.3rd was any work performed on the gas service (new gas stove,clothes dryer,hot waterheater,fireplace) there might be air in the gas pipe that has to be purged out.It is safe to reset the unit and let it attempt to light 3 trys.(turn the power switch on/off) untill the air is out.Listen for a "click" from the gas valve thats is when the gas is on.It is a fuel supply problem,is the gas to the house turned on?any street digging in front of the house by others?Your utility company can check.
I would insist that Sears either have a Senior tech come out and fix it or return it to the state it was prior to them touching. Then call some one else. Have them involve the Goodman rep in your area.
If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve. Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.
ecms are pretty reliable and electronic failure is much more common than bearing or bushing wearout. i suspect the fins on the blower may be coming loose from their pressed on spline and that will start a vibration or shimmy or you could have thrown a weight that balanced the wheel . best to use to warranty to get a new wheel. good luck