Kenmore Furnace: Making Loud Noise
Often a failing inducer or blower motor, a loose belt, or delayed ignition. Add a photo of your Kenmore Furnace in the box below: the Triage Profile says what it is, how urgent it is, and who to call.
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In the next five minutes
Safe first steps, before the call. Nothing here needs a tool.
If you smell gas, a carbon monoxide alarm sounds, or anyone feels dizzy or sick: don’t touch any switch or plug, leave and get everyone out, then call 911 or the gas company from outside.
No gas smell? Note what the noise sounds like and when it happens, then switch the furnace off at the thermostat and at its breaker.
Don’t use it again until it’s checked, and keep people away from it.
Everything else about this problem
Is it an emergency?
Is a loud noise from a Kenmore furnace an emergency?
Usually not, but it can be. A grinding, rattling or humming that has just started most often comes from a fan, motor, belt or loose panel. Stop using it and cut the power if the noise comes with a burning smell, smoke or sparks; if it runs on gas and you smell gas, leave and call the gas company or 911 from outside.
Symptoms & causes
Loud noises in a Kenmore furnace often manifest as banging, screeching, rattling, or humming sounds, each pointing to different potential issues. Banging can indicate dirty burners or a cracked heat exchanger, while screeching usually points to a failing blower motor bearing or a loose belt. Rattling might be loose panels or ductwork, and a loud hum could be a failing capacitor or a motor struggling to start.
Tools & parts
For checking and repairing loud noises, essential tools include a screwdriver set, a multimeter for electrical checks, and a wrench set. Specific parts that might be needed are a new blower motor capacitor, a replacement blower belt, or new motor bearings. Always ensure you have a flashlight for inspecting dark areas and a shop vacuum for cleaning dust and debris from the blower assembly.
Safety first
Before attempting any inspection or repair on your Kenmore furnace, always turn off the power at the thermostat and the main electrical breaker for the furnace. Be aware of sharp metal edges inside the furnace cabinet and wear appropriate gloves to prevent cuts. Never operate the furnace with panels removed, as this can expose you to moving parts, high voltage, and carbon monoxide if the combustion chamber is compromised.
When to call a pro
A professional technician is required if the loud noise is accompanied by a burning smell, which could indicate an electrical short or overheating components. If you suspect a cracked heat exchanger, characterized by a strong metallic smell or visible cracks, immediately call a professional as this is a serious carbon monoxide hazard. Complex electrical issues, such as a faulty control board or a shorted motor winding, should also be handled by a certified HVAC technician due to the specialized testing tools and expertise required.
Questions people ask
Why does my Kenmore furnace make a loud banging noise when it starts?
This often indicates delayed ignition, where gas builds up before igniting, causing a small explosion. It could be due to dirty burners or a faulty igniter, requiring cleaning or replacement.
What causes a high-pitched screeching sound from my Kenmore furnace?
A screeching sound typically points to a worn-out blower motor bearing or a loose/frayed blower belt. These components need lubrication or replacement to restore quiet operation.
Is a rattling noise from my Kenmore furnace always serious?
Not always; it can be as simple as a loose access panel or ductwork vibrating. However, it could also indicate a loose component inside the blower assembly or a failing inducer motor, which warrants further investigation.
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What it is, how urgent, who to call
Add a photo of your Kenmore Furnace in the box at the top. The Triage Profile says what it is, how urgent it is, and who to call.