Under proper operating conditions, your furnace should only make a quiet whir from the circulating fan. Other noises often indicate problems that need attention to prevent further damage to your system. This guide explores possible sounds a furnace may make and the problems they may signal for your Mesa, AZ home.
Clicking
Your furnace may click as it runs through a normal heating cycle. Normal clicking is usually a single click at a time and only a few per cycle. Repeated clicking may indicate a problem with the ignition system like a dirty burner or a dirty or damaged flame sensor.
Whistling
Whistling occurs when the system tries to draw air through a small space, such as when there’s an airflow restriction. The most common airflow restriction is a dirty air filter. Replace the air filter every 30 to 90 days for the common 1- and 2-inch filters.
Humming or Buzzing
Humming and buzzing usually originate from an electrical component and is a signal that it’s not passing current properly. Faulty capacitors and fan motors are common sources of humming and buzzing. A comfort specialist will check components that could hum or buzz during routine furnace maintenance.
Scraping or Grinding
Scraping or grinding usually indicates a worn component that needs replacing, and it’ll usually cause ineffective heating. While scraping may indicate a problem with a worn or broken fan wheel, grinding usually traces back to worn bearings. If you hear either of these sounds, shut the system down until you can have it evaluated.
Rattling
Rattling usually indicates a loose or broken part. However, if it only happens at the beginning of a heating cycle, it may indicate a cracked heat exchanger. This constitutes a heating emergency because it can allow carbon monoxide to leak into your home.
Paying attention to the sounds your furnace makes can alert you to problems that need attention. If your furnace is making unusual sounds, don’t ignore them hoping they’ll resolve on their own. Call to schedule a furnace repair with one of the NATE-certified comfort specialists at SMW Refrigeration & Heating.
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