Popping Noises At the beginning of a heating cycle, the blower motor distributes warm air into the air ducts in your house. If you notice a loud popping noise when your furnace is activated, the source of this problem is inflation in your air ducts.
Why is my furnace making a crackling noise?
Hearing crackling coming from your furnace may also seem like a major problem, especially since this sound often indicates the presence of excessive heat. However, a furnace making a crackling noise usually occurs when the heated metal components within the unit start to cool down as the system cycles off.
Why does my oil furnace make a loud noise when it turns on?
A loud bang or pop occurs when the furnace turns on – A popping, booming or banging noise when your oil or gas furnace turns on is not normal. It may indicate that the system’s burner is having trouble reaching a temperature hot enough to ignite the fuel. This causes fuel to build up for longer than it should.
Can a furnace explode?
The modern gas furnace is much safer than electric space heaters, and furnaces are built to high safety standards. Although it is possible for a gas furnace to either catch fire or explode, it’s highly unlikely. If there is a danger of this happening, the furnace will usually simply shut off—as it’s designed to.
When should I worry about my furnace noise?
Some noises coming from your furnace are normal and indicate your furnace is working correctly. However loud or funny noises could indicate a need for heating repair. If you think the unit sounds funny, or just doesn’t seem to sound like it usually does, you’re probably right!
What does a bad furnace sound like?
A dull hum is normal while your furnace is running. But if you hear a loud humming or buzzing sound coming from your furnace, it usually means your furnace has an electrical problem. The most common electrical issues that cause a humming or buzzing sound include: A failing blower motor capacitor.
Can oil furnace explode?
Unlike natural gas, heating oil doesn’t explode; in fact, heating oil doesn’t even burn until you heat it to 140 degrees and vaporize the fuel, which is exactly the process that happens inside your furnace. Drop a lit match into a can of heating oil and it will go out, just as if you dropped it in a can of water.
Why is my furnace making a rattling noise?
A bang or rattling sound from your furnace could mean that you have a cracked heat exchanger, which is the biggest cause of carbon monoxide leaks. A rattling sound before the blower comes on almost always means a cracked heat exchanger.
Why does my gas furnace sound like running water?
A bubbling or gurgling water sound coming from your indoor AC or furnace unit is usually an indication of a pressure issue. Improper internal pressure could be due to an overcharge of refrigerant (too much). It could also be the result of a refrigerant leak.
Why is my furnace blower so loud?
If you are hearing loud screeching and rattling noises when you turn your furnace on, the bearings in the blower motor or the blower motor itself could be to blame. Your blower motor forces the warm air out of your furnace and through the air ducts in your home.
What does a cracked heat exchanger sound like?
If you have a crack in the heat exchanger, you are likely to hear a rattling noise as your thermostat turns on the heat. Because the heat exchanger is made out of metal, as it is heated cracks will expand/contract, and can cause rattling, popping, and/or banging noises.
Can I run my furnace with a cracked heat exchanger?
Rule #1: If your Heat Exchanger has been deemed cracked by a HVAC professional you should NOT be running it. Unfortunately, some owners will attempt to run their furnace even when a cracked heat exchanger has been detected.
How much does it cost to replace a furnace heat exchanger?
$2,000 to $3,500
If so, here’s the thing: replacing a heat exchanger isn’t as simple or affordable as it sounds. In fact, replacing a furnace heat exchanger can take up to 8 hours and can cost anywhere from $2,000 to $3,500.
How can I tell if my furnace is leaking carbon monoxide?
Signs of Carbon Monoxide Leaks
- Soot: You may notice soot-like stains on your furnace. …
- Smell: While carbon monoxide doesn’t emit odor, it may get accompanied by other exhaust gases that produce an odor.
- A yellow burner flame: The pilot flame may produce an unusual yellow flame instead of the normal blue one.
Can a broken furnace leak gas?
Gas leaks can occur in the gas supply line to your furnace, but they are commonly caused by a cracked heat exchanger. Normally, gas is combusted in a chamber inside the heat exchanger, and the blower blows air over it to pick up the heat before it circulates through your ductwork.
What are the signs of carbon monoxide poisoning in your home?
The most common symptoms of CO poisoning are headache, dizziness, weakness, upset stomach, vomiting, chest pain, and confusion.
How do you tell if your furnace is venting properly?
How Do I Know If My Furnace Isn’t Venting Properly? Gas furnace fumes are moist, so if you notice “sweat” on your windows, this is a sign that your furnace isn’t venting correctly. When your furnace comes on in the morning, if it is venting into your house rather than outdoors, moisture will condense on the cold glass.
How do you check for clogged air ducts?
A specific duct may be clogged if there’s no improvement. From there, you can inspect your ductwork by first unscrewing the vent covers and checking behind the vent grille for debris. Use a flashlight to check the inside of the ducts, taking note of any damage around the seams and making sure the dampers are open.
What is Backdrafting on a furnace?
Backdrafting is the reverse flow of gas in the flues of fuel-fired appliances that results in the intrusion of combustion byproducts into the living space.
