If your ductwork or furnace starts to make noises, you will want to make sure this is corrected as soon as possible. If you hear a loud and sudden bang or boom, it’s probably due to a buildup of gas and a delayed ignition. This is similar to what may happen if you leave the propane gas grill on for too long before igniting it. There are different reasons for why you may have a delayed ignition, dirty, clogged burners are causing a delayed ignition. When your furnace finally lights, the gas build-up in the combustion chamber creates a loud bang or boom that reverberates throughout your home. There is an unbalanced air-to-fuel ratio. If there is too much air, or too little gas, this could be causing your gas to build up, leading to the resulting explosion.
A rumbling furnace noise can indicate a serious problem with your motor bearings, gas burners, or pilot light. A house-shaking rumbling on the other hand could be due to un-burnt fuel in your combustion chamber that burns even after your furnace shuts off. If this is happening, then you could be putting your family at risk of carbon monoxide poisoning.
If you are hearing a rattling furnace noise before your blower turns on, this could be due to a cracked heat exchanger. A cracked heat exchanger is a serious furnace problem that should not be neglected. It is the number one cause of carbon monoxide leaks from your furnace. If you hear a rattling sound before your blower comes on, immediately turn your furnace off. If you hear a rattling sound after your blower comes on, this could be due to loose ductwork connections.
When your furnace kicks on, it is normal to hear a clicking sound. This is just your ignition clicking on. If, however, you hear excessive clicking, you may have a problem with your flame sensor. Over time, your flame sensor gets dust and debris buildup, which prevents proper operation. If your furnace clicks and clicks without ever coming on, this is most likely due to loose wiring or a leaky gas valve. Or if you hear a swooshing or swishing and then a click, this could also mean a leaking gas valve. A clicking and clacking sound before the blower turns on can indicate a crack in your heat exchanger, a very dangerous proposition. A leaking gas valve and cracked heat exchanger are serious issues not to be taken lightly. Make sure to contact us at an noise you hear, so we can inspect the furnace system for you.