Your furnace is working hard to keep your home warm, but lately, you’ve heard some strange noises. Should you be worried? Some sounds are normal, while others could indicate something’s wrong. Here’s a breakdown of common furnace noises, what they mean, and when it’s time to call in a professional. If you’re looking for furnace repair in Mission Viejo, our experienced team at Command Comfort can help diagnose and fix the issue quickly.
Normal Furnace Noises
- A Low Humming Sound: If your furnace makes a soft humming noise when it’s running, don’t panic. This is the sound of the blower motor operating, and it’s completely normal. If the hum gets excessively loud, though, it could indicate a problem with the motor or a failing capacitor.
- Clicking When the Furnace Starts: A clicking sound when your furnace starts up is typical—this is just the ignition system firing up. However, if the clicking continues without the furnace starting, there may be an issue with the ignition or gas valve.
- Light Airflow Whooshing: When your furnace cycles on, you’ll hear the movement of air through the ducts. This whooshing sound is expected, but if it becomes too loud, you might have a clogged filter or leaky ductwork.
Noises That Indicate a Problem
- Banging or Booming: A loud bang when your furnace starts up is often caused by delayed ignition. This means gas is building up in the system before igniting, which can lead to small explosions inside the furnace. If left unchecked, this can damage the heat exchanger and lead to expensive repairs. It’s best to call a professional ASAP.
- Squealing or Screeching: If you hear a high-pitched squeal or screech, your furnace may have a worn-out belt or a problem with the blower motor. These parts can wear down over time, but catching the issue early can prevent bigger (and costlier) problems later.
- Rattling or Vibrating: A loose panel or screw can cause rattling noises. If tightening things up doesn’t help, the rattling might be coming from the blower motor or heat exchanger—both of which require professional attention.
- Constant Clicking: While an occasional click is normal, constant clicking isn’t. It could signal an issue with the flame sensor, gas valve, or even an electrical component. If you notice repeated clicking and your furnace isn’t turning on properly, it’s time to schedule a repair.
- Hissing or Whistling: A hissing sound could indicate a gas leak—if you smell gas alongside the noise, turn off your furnace immediately and call for emergency service. If there’s no gas smell, the issue might be with your air filter or ductwork.
When to Call a Professional
If your furnace is making strange or persistent noises, don’t ignore them. Small issues can turn into expensive repairs or even safety hazards if left unattended. Whether it’s a worn-out belt, a dirty burner, or a more serious problem, getting professional help sooner rather than later can save you time, money, and stress.
Contact our team at Command Comfort today! Climate Control for Life.