The old saying that “It is better to be seen than heard” certainly applies to the mechanical equipment in your Houston home. If you hear a squeaky noise or loud clattering you automatically suspect that something is wrong. And if that noise is coming from your furnace, you better pay attention to it. A noise is an obvious sign of a problem – minor or major – and it could result in mechanical failure that could leave your home cold and uncomfortable – and affect your home’s indoor air quality.
Today’s newer variable-speed furnaces keep a constant airflow through the ventilation system utilizing a low speed fan that consumes small amounts of electricity. Constant airflow brings in fresh air and keeps the room air from becoming stale or stagnant. Because of this constant operation, it is important to ensure the furnace is running at peak efficiency, which also means that it is running quietly.
Here are some common noises, possible reasons, and suggested repairs. As always, if you are in doubt about how to repair your furnace, call a local heating contractor and schedule a service call.
Squealing noise – could be a worn out or slipping blower belt. Check for proper tension of the belt or replace the belt if it is worn out or cracked.
Squealing noise – could be worn out motor shaft bearings. Lubricate the blower motor at the proper points.
Rumbling noise – often caused by a poorly adjusted pilot light when the burners are turned off. Adjust the pilot as necessary.
Rumbling noise – often caused by dirty gas burners when the burners are switched on. This problem requires service from a qualified heating technician.
Buzzing noise – often caused when a blower motor mounting come loose. Tighten the mounting screws or use shims to fill gaps.
Hissing noise – indicates a possible air leak. This problem requires service from a qualified heating technician.
Ticking noise – possibly a leaky gas valve. This problem requires service from a qualified heating technician.
Rattling noise – could be a dirty fan blade. Wipe the fan blade or clean with degreaser.
Rattling, grinding, or whining – could be resistance to airflow that causes the motor to work harder. Check the vents in each room for dirt, debris, or obstructions and clear them.
Vibrating noise – may not be the furnace but loose or cracked seams in the ventilation system. Check the ductwork seams and hangers to ensure everything is tight. You may need duct tape or bracket hardware.
The best way to keep your furnace and ventilation system from making noises is to practice preventative maintenance. Have your furnace checked annually by One Call’s service technicians – and enjoy the peace, quiet, and uninterrupted heat provided by a well maintained furnace!