Sometimes homeowners call the office wondering if they need to schedule a service call, because although the heating system is working, they complain that the furnace is making a new and/or unusual sound. In almost all instances, we recommend scheduling service whenever the furnace starts making sounds.
Anytime there is a change in how the heating system behaves—whether it’s a new sound or a new smell—it’s an indication that something’s wrong. Continuing to run the system could be causing significant internal damage that could eventually cause a complete furnace breakdown.
Most often, people describe the noises they’re hearing as screeching, chirping, rattling or knocking.
Screeching Furnace Sound
This usually indicates an issue with a belt, bearing or motor. It could be a sign that a component is wearing down and needs to be replaced.
Chirping Furnace Sound
If there is a constant chirping sound when running the furnace, it could be a symptom of a faulty belt.
Rattling Furnace Sound
There are many reasons the furnace could be rattling. It could be as simple as a loose panel door, even a screw or bolt breaking due to age, the furnace expanding from the temperature change, or it could indicate a more serious issue inside the system.
Knocking Furnace Sound
Furnace or duct expansion (and contraction) could be one reason for a knocking/clanging sound. Another reason could be a damaged belt or bearings. It can be difficult to pinpoint the problem as a whole without hearing it in person.
In order to properly diagnose the new furnace sound, a technician needs to be onsite to hear it and then investigate the cause. The best course of action whenever your furnace is making sounds is to call a trusted and respected HVAC company.
HAMCO Heating & Cooling Ltd. has been providing excellent service to area homeowners for over 70 years. We’ve built our reputation on honesty and integrity and have grown to be one of the premier heating and cooling companies.