There are a variety of problems that can cause your furnace to produce loud noises. Types of noises such as scraping, banging, whistling, and popping may be a sign of a loose part, cracked heat exchanger, or dirty gas burners.
Turn off power to your heating system. Open the panel to the blower compartment so you can see the fan belt and motor. Check for signs of fraying and wear – a damaged fan belt needs to be replaced. If the belt is loose, it needs to be tightened – there shouldn't be more than a half inch of give in either direction.
The buildup of dirt and debris: The blower wheel and fan blades may get covered in dirt and other particles over time, creating an imbalance that produces loud noises. Your blower wheel component within your furnace will need to be cleaned by a professional technician.
Most frequently, the cause of a noisy radiator is air being trapped inside the system. If this is the case, it is recommended to fix this issue as soon as you can. If you find you can hear noisy pipes (especially during colder weather) this could be down to a frozen condensate pipe.
Insulate Your Ductwork
If your ductwork isn't properly insulated or doesn't have insulation, add insulation to duct runs in the basement or attic. The insulation should be formed and designed to insulate ducts. The insulating material will muffle loud noises from within and it can improve energy efficiency as well.
It's often said that you shouldn't be able to hear a central heating system that's running well and efficiently. Your heating should come on and off seamlessly with little to no noise.
There are a variety of problems that can cause your furnace to produce loud noises. Types of noises such as scraping, banging, whistling, and popping may be a sign of a loose part, cracked heat exchanger, or dirty gas burners.
A low hum is normal while the furnace runs, but if the noise is loud during a cycle or comes on when it wasn't present before, there could be an issue with the fan or capacitor.
A gentle humming or clicking is normal, but loud rattling, banging, buzzing, or whistling means you may have a problem requiring professional help. Some factors that cause excessively noisy ducts include dents or damage, loose metal parts, dirty or blocked vents, and closed dampers.
Loud Bangs, Rumbles, Knocks, or Booms
Loud noises like this are a sign of a build of gas in a furnace. The noise you hear can mean your heat exchanger is at risk of cracking. Even worse, it's a sign that something dangerous could happen if you continue to use your heater.
If your furnace is making an obnoxious noise, it's likely because the furnace blower motor is turning on and off as part of normal heating furnace cycles. Make sure your thermostat is set properly to the desired temperature and off when you don't need heat (like overnight).
A common reason for furnace buzzing is a loose transformer box. A furnace transformer regulates the incoming voltage to an appropriate voltage for the furnace to use. This is more common after a new installation. With an older furnace, the transformer may be malfunctioning and needs to be replaced.
If you're hearing a loud banging or booming noise, this could indicate your furnace has dirty burners. This is hazardous as it can hinder the ignition. This delay in ignition triggers a gas build-up, producing a little explosion when it finally does light. Your burners should be regularly cleaned to avoid this issue.
We recommend placing your furnace directly on some rubber isolation pads or on a rubber isolation mat. Anywhere you feel vibrations (even ducts) is transmitting structural noise and needs to be isolated with rubber.
If you hear similar clanging or loud banging noise in the walls, it can be a sign of clogs or air pressure in the system called a water hammer. If you don't resolve the problem, it can cause damage to the pipes, so consult a professional.
Over time and lots of use, air can creep into your central heating system and, when enough air gets trapped, it can cause your pipes and system to make noise. Water and air flowing through pipes and radiators can result in clicking, ticking or tapping noises.
On a normal day, your home's furnace might make a little noise as it starts up, when it's turning on, and then when it turns off. You can always expect to hear some noise from the furnace. The thing about this noise is that it should never be disruptive.
Luckily, there's an easy fix to eliminate the sound or at least make it less noticeable. The noise is essentially caused by the heating element being installed on a wall that is warped or slightly uneven. To fix it, just readjust a few screws so the unit fits snugly against the wall without pinching the element.
Check all belts and replace any that are damaged or worn out. Also, check for loose screws in both fans and vents and tighten them if necessary. If your furnace uses two separate fan units (one on each side), be sure to check the screws on both of them.
The Problem: Loose or Cracked Parts
The first is that a furnace part is broken or loose. This usually means a panel, ductwork connection, or fan belt. The second common cause is a cracked heat exchanger.
In order to maintain a comfortable home environment and reduce energy consumption, it's important to ensure your HVAC system is running at an optimal noise level. Ideally any appliance or HVAC system should never create sound louder than 60 dB inside your home.
In light of this, we can reveal the most common problems to expect if a home is not adequately heated during the colder months. From damp, mould, frozen pipes and – in some of the worst cases – health problems, these are the issues that could occur if you neglect to heat your home.
Step 1: Turn off your central heating and wait for around 20 minutes for the system to cool down. Step 2: Lay a dry cloth or towel beneath the radiator you want to bleed, just in case any water escapes. Step 3: Use your radiator key to slowly open the valve, turning it anti-clockwise to do so.
Your pipes and other parts of you plumbing system may be making noises for a number of reasons, such as: Rattling: Your pipes are loose and not tightly secured. Banging: Your appliances are shutting off too quickly, causing a water hammer. Screeching: Your plumbing fixtures or faucets need to be replaced.