Furnaces are made of metal and have internal moving parts, so it is natural to hear a few noises every now and then. However, most furnaces are not noisy, and any new abnormal sounds that you have not heard before can be a sign that it needs attention.
St. Louis HVAC experts believe that most of the noises coming from your furnace are not cause for alarm.
You should be aware of the sounds your furnace makes and if you should be concerned:
Screeching noise: This could be caused by problems with the motor, bearing or belt. Though not hazardous, if not attended to, it could larger repairs in future.
Chirping sound: It usually occurs when the furnace has not been in use for a while and it could just be an indication of the heat coming on. However, if the noise continues or worsens over time, you may have to consider a belt replacement.
Rattling sound: This could be an indication of a loose panel and it may be fixed easily by tightening the cover panels. If this doesn’t seem to be the problem, the noise may be a coming from the expansion and contraction of metal parts. If the noise continues, it may be a sign of something more serious.
Knocking or clanging noise: It usually occurs when the furnace starts or when it stops blowing hot air. The vents, pipes and metal housing can make a knocking or clanging noise as they heat up or cool down. Again, if the knocking sound is continuous though and occurs when the furnace is running, it could be a sign that you need to contact a St. Louis HVAC technician.
Humming sound: One of the most common sources of this problem is the blower motor. To fix this, you should turn off the motor and allow it to cool. Once it has cooled down to a safe temperature, you should check the motor. This sound could simply be a result of improper lubrication.
Loud boom or bang: If this noise is coming from the heater, the likely problem could be a delayed gas ignition. This happens when has in the furnace does not ignite immediately and the gas builds up. When it ignites, it causes a mini-explosion, which can damage the furnace. Another cause could be expansion and contraction of the metal ductwork when the blower starts. To fix this, make sure that all supply vents are open and try changing the air filter. If this does not help, contact a St. Louis HVAC repair technician.
HVAC systems require the expertise of professional technicians for proper installation, maintenance and repairs. If you are facing any problems with your furnace, you should immediately contact a St. Louis HVAC Repair specialist.