Quick Answer: Why Is My Furnace So Loud When It Kicks On?

What does a bad blower motor sound like?

As the impeller blades are plastic, it’s also pretty easy for them to snap off.

You might hear this as a noise coming from directly behind the vent, perhaps a light slapping, or a sudden pop before you notice a problem with airflow.

Whirring noises might also result from a bad bearing in the motor..

What can cause a furnace to explode?

Delayed ignition is when that gas isn’t ignited immediately, allowing the gas to build up in the furnace. The gas keeps building until—BOOM—it reaches a flame and finally ignites, causing a small explosion in your furnace.

How can I make my fan motor quieter?

Keep The Fan On A Level Surface. A rattling or clicking noise may be caused by your fan’s base hitting an uneven floor. … Sit Your Fan On a Rug or Carpet. … Clean It Thoroughly and Regularly. … Tighten Loose Screws or Knobs. … Align Fan Blades. … Oil The Fan Motor. … Replace Damaged Cushioning. … Hack The Fan Cage.

Are high efficiency furnaces quieter?

So how does that correlate to noise? Well, typically, higher AFUE ratings correlate with lower decibel levels (i.e. quieter operation). That’s because, more efficient furnaces have more advanced motors and components that operate smoothly, quietly and at lower “speeds” (which brings us to our next factor).

Why is my return air vent so loud?

When vents or ducts are clogged with dust and debris, the result is reduced airflow which can cause annoying noises. … Another sign of poor ductwork, and a culprit of noise coming from your air return vents, is unlined return ducts.

Are new furnaces quieter?

Most heating systems manufactured today are quieter than those produced in past years. … Since the low speed setting is adequate to meet household-heating demands approximately 80 percent of the time, the furnace is much quieter than a conventional single-stage furnace.

Why does my furnace make a loud noise when it turns on?

A delayed ignition causes a sharp bang or boom heard when the furnace burner cycles on. The pilot flame or electric igniter should ignite gas flowing from the burner as soon as the thermostat opens the gas valve. … When this cloud belatedly ignites, it produces a loud sound within the metal furnace cabinet.

How do I reduce the noise from my furnace?

Fix the weak spots. If the ductwork in your furnace is faulty, the furnace will produce a banging sound because of the oil-canning. … Fix the gas ignition problem. … Replace dirty filters. … Fill the gaps in the ducts. … Resize your air ducts. … Fix the loose parts. … Repair your ductwork. … Fix the motor.More items…

How do I stop my furnace from banging?

Another trick to reducing or stopping the banging noises is in adding insulation around the ductwork. Add insulation to the entire run of ductwork that is either in your basement or your attic. Make sure you use insulation that is specially formed for insulating the ducts.

Is it normal for a furnace to make noise?

Normal Furnace Noises When a furnace starts up to run a heating cycle, most homeowners notice some noise. This noise is typically not something to worry about. … The normal noise a furnace makes during a heating cycle should not be disruptive inside your home.

What are the signs of a bad blower motor relay?

What are the symptoms of a bad blower motor resistor?No Air. … High speeds only. … Low speed only. … Fan won’t turn off. … Blower motor works on some settings but not others. … Smoking vents. … Burning smell.