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A Noisy Furnace: What It Might Mean

service-technician-and-furnaceA furnace is one of the best ways to keep a home comfortable through the winters, whether it’s a mild cold or a deep freeze! The gas furnace is especially powerful at putting out levels of warmth to keep an entire household comfortable.

But if you have a furnace working in your house, you’ll need to pay a bit of attention to it if it begins to act strangely. Such as when it makes noises you aren’t accustomed to hearing, or if it starts to just make too much noise in general. This is often a sign you need to call for professional heater repair in Raleigh, NC. Never try to do the diagnosis and repairs on your own, since this can lead to potentially hazardous situations and a furnace that’s in worse shape than it was before.

The More Common Furnace Warning Noises

Although you shouldn’t use this list as a guideline for trying to go DIY with a furnace repair, it can help you understand what might be going on.

  • Rattling: This may be loose parts in the furnace, probably in the blower fan. One simple possibility is that the door of the HVAC cabinet is loose—check to see that it’s closed correctly. Otherwise, call for repairs.
  • Clanging: If the sound you’re hearing is a sharp sound of metal striking metal, it’s likely trouble with a bent fan blade in the blower which is striking the casing. This needs to be fixed right away, or it can create extensive damage to the air handler.
  • Shrieking: The bearings on one (or more) of the motors are wearing down. If the bearings wear down completely, it will end up wrecking the motor. It’s more expensive to replace a motor than to replace the bearings, so have the repair pros on the job ASAP.
  • Grinding: Mechanical grinding noises are among the noisiest problems you’ll encounter with a furnace, and it points toward a motor on the verge or burning out from overheating. Usually, the motor will need to be replaced.
  • Booming: This is when a large amount of combustion gas builds up in the combustion chamber before the lighters ignite. The sudden combustion of all this gas makes the “booming” noise. A repair technician can find out why the burners are not lighting when they should.
  • Clicking: This may be the fault of a broken electronic ignition system or failed motor capacitors and relays. A more serious possibility is that it’s due to cracks in the heat exchanger—which can lead to the escape of toxic exhaust from the furnace. Please have HVAC experts look at the furnace as soon as you can arrange it.
  • Slapping: For older furnaces that still use a fan belt (newer ones have direct motors), this indicates the belt has come loose.

A reminder: don’t go hunting for the cause of the sound yourself. That’s our job, and we’ll do it thoroughly and then complete the repair that will get your furnace working at its best once more.

Comfort Master Heating & Air Conditioning, Inc. offers excellent heating service throughout the Triangle Area. Have us repair your troublesome furnace.

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