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Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
Does your furnace start up with a boom or bang? There’s a good chance that the unit is having delayed ignition problem. The good news is that there are some simple steps you can take to try to fix the ignition problem.
When the burners are getting gas, but the gas doesn’t light right away, this is called delayed ignition. So, that gas has time to build up, and when it finally starts to burn, it makes a small explosion.
When your thermostat tells the furnace to heat up, a gas valve opens and gas flows to the burners, which then light the gas. With delayed ignition, the gas isn’t set on fire right away, so it builds up in the furnace. The gas keeps building up until it reaches a flame and explodes in your furnace.
Imagine being in a room full of gas and someone lighting a match, or you turning on the burners on your gas grill but waiting a moment before pushing the “ignite” button. Yes, that’s how delayed ignition on gas furnace is.
There are many problems that could happen, and all of them need to be fixed by a trained technician. But if you want to talk the talk, you should know that delayed ignition can be caused by:
Not only does a delayed ignition sound like an explosion, it is an explosion. If you don’t pay attention to these small gas fires, it could get very dangerous.
A delayed start is bad for more than one reason. For one thing, every time gas explodes, it puts stress on the parts of your furnace and can cause them to break. A delay in starting the car is also dangerous. Because the problem lets your furnace fill up with extra (flammable) gas, you could get burned by a flash fire if you try to manually relight the pilot light.
If nothing is done to stop them, the ignition problem will probably get bigger over time. The more shaking there is, the more likely it is that the stack pipe will come loose and soot will get all over your house.
The extra flames that come from delayed ignition can also crack the heat exchanger, which is one of the most expensive parts of your furnace. When this happens, most people choose to replace the furnace instead of the heat exchanger because replacing the heat exchanger is too expensive and may cause carbon monoxide leaks during installation.
The problem of a slow-starting furnace is easy to avoid. All you have to do each fall is make sure your furnace is cleaned well before you turn it on. A professional heating technician will clean the burners and ports and remove any dust, lint, rust, or sulfur buildup that could block the ignition and cause a delay.
If your furnace sounds like it’s booming or banging when it turns on, you should call a professional right away. It might seem like a small problem right now, but if it keeps getting worse, it could become a much bigger one. On the other hand, a precise tune-up and professional cleaning of your furnace can find a problem with delayed ignition on gas furnace that is causing the dangerous problem.