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Unusual Noises From Furnace
Posted On: November 28, 2024
If you’re hearing unusual noises from your furnace, it could signal a problem that needs immediate attention. Here's a guide to some common noises and their potential causes:
1. Banging or Popping
- Cause: This often indicates delayed ignition or expanding ductwork. Delayed ignition occurs when gas builds up before igniting, creating a mini-explosion. Expanding or contracting ducts can pop as they adjust to temperature changes.
- Solution: Have a professional inspect the burners for buildup or check the ductwork for loose connections.
2. Squealing or Screeching
- Cause: These high-pitched noises may be due to a loose or damaged blower belt or bearings that need lubrication.
- Solution: Tighten or replace the blower belt and lubricate moving parts as needed.
3. Rattling
- Cause: Loose panels, screws, or components inside the furnace can create a rattling sound. It could also indicate a cracked heat exchanger, which is a serious issue.
- Solution: Tighten loose components. If the heat exchanger is cracked, call a technician immediately to prevent carbon monoxide leaks.
4. Booming
- Cause: A loud boom is usually linked to gas buildup in the ignition system or dirty burners.
- Solution: Have a professional clean and inspect the burners to ensure proper ignition.
5. Humming
- Cause: A low humming sound might indicate an electrical issue with the blower motor or transformer.
- Solution: Check for loose wiring or call an HVAC technician to diagnose the problem.
6. Clicking
- Cause: Repeated clicking might be caused by a failing ignition system or a relay that isn’t working correctly.
- Solution: Test the ignition system and inspect relays for faults.
7. Whistling
- Cause: Whistling noises are often due to restricted airflow caused by dirty filters or closed vents.
- Solution: Replace the air filter and ensure vents are open and unobstructed.
Why You Shouldn’t Ignore These Noises
Unusual furnace noises often point to underlying issues that could worsen over time, leading to higher energy bills, system breakdowns, or safety hazards like carbon monoxide leaks.
If your furnace is making any of these noises, it’s best to call an HVAC professional for a thorough inspection and repair. Regular maintenance can prevent many of these problems, ensuring your furnace runs quietly and efficiently.
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I needed a new furnace and A/C to replace my 21 yr. old units, and went to the internet to view potential companies in May, I received 3 quotes,
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