Hi, I'm Vance and welcome to Repair and Replace. A noisy furnace is more than just annoying, it's a good indicator that something is starting
to fail. In this episode, we're going to learn about
the most common sounds and their causes. We'll briefly cover each repair, but if you
need more information then watch the videos linked in the description. Lets begin. After the burners are lit, the blower fan
pushes the warm air around your home. The wheel is generally held on by a set screw. If the set screw is loose then the blower wheel will shake and make
a rattling noise while it turns. Now if the mounting bolts become loose it
can also cause the motor to shake. To reduce the rattling, tighten the mounting
bolts and the set screw. The blower fan can also make a grinding noise
if part of the fan scrapes against other metal. Also check to see if something is stuck inside
and is hitting the fan blades. Another source of noise is when the motor
bearings wear down.
And this might sound similar to a truck idling. Overall if the motor is starting to fail,
then its best to get a replacement. The draft inducer fan pulls air into the heat
exchanger before ignition. Overtime the bearings in
the motor can wear out. These are smaller motors and will sound a
little different than the blower fan. Now if the inducer motor is starting to fail,
then its best to replace it. Some furnaces use a belt drive motor. These belts can wear down over time. If the V-belt gets dirty, is out of alignment,
or if its slipping, then it can start squealing. This might sound similar to
a belt on an old car. Try cleaning the belt, and check the alignment. If it looks a little worn, then its best to
replace the belt. If you notice loud pops or metallic bangs
when your furnace runs, then you're probably hearing the ducting. As hot air flows through, the sheet metal
expands and contracts making a popping sound. These bangs might be annoying
but it's not problematic, and won't affect the operation of your furnace.
Hopefully this has helped you figure out the
source of your furnace noise. If you want to see more tutorials and informational videos, then subscribe to our
channel. And if you need help, you can call or visit
an AMRE location to talk with our knowledgeable staff. Thanks for watching..