Low Humming Noise In Furnace When Off. Odd sound after furnace turns off after my furnace turns off the very second it makes this creak or low vibrato deflating kind of sound. Hi I live on the second floor of a condo and hear a loud constant low pitched humming noise coming from inside the wall where the tubing enters the unit from the outside and travels up the wall and across the ceiling to the internal blower.
I just got a carrier furnace installed yesterday. When it has cooled down to a safe temperature check the motor. Why Does My AC Make a Slamming Noise When Shutting Off.
It may simply be that the motor doesnt have enough lubrication but it can also mean that a motor failure is imminent.
Most appliances emit a low buzz or a soft hum while they are in use. If the vents and grilles are obstructed air flow is reduced and a humming noise may result as the furnace works harder to operate. Before attempting to work on your furnace make sure you turn off power at the source. You can test this by turning off the main power switch to the furnace and the hum should disappear.