why does my boiler bang when it ignites

I wouldent like ot comment on the gas, but I did have a similer problem at my old house. The boiler would run ok for a time, and then for a short period the boiler would start banging (quite nasty). It turned out that the circulation pump was intermittently stalling, hence the water in the heat exchanger was vapourizing. The so called plumber who serviced the system the month before must have f****d about with it or somthing!! anyway, The heat exchanger had to be replaced at around бе300, as it had split due to this. Word of advice, check the pump is circulating at boiler startup, if thats ok, there could be air in the system (unlikely, but worth mentioning)
It s terrifying. Your gas furnace, which normally works fine, kicked on with a scary BANG or BOOM noise. It s not only disturbing, but it can wake light sleepers up in the middle of the night.


What the heck is going on? To know which is the problem, determine where the loud noise originates from. Stand near your furnace as it s about to turn on and listen: If the furnace made a clicking noise trying to turn on and then makes the BANG noise at the furnace, it s most likely a delayed ignition. If the noise originates a few feet away from the furnace when the blower turns on, the problem may be expanding air ducts. Let s go into detail about these 2 issues. Delayed ignition Imagine a room full of gas and then someone decides to light a match. Big problem, right? Well, that s what s happening in your furnace if the ignition of gas is delayed. You see, this is what normally happens when your thermostat calls for heat from the furnace: The gas valve opens and sends gas to the burners where it s then ignited by the ignitor (or pilot light for older furnaces).


Your blower blows air over the heat exchanger and then pushes that heated air throughout your home. (. ) But a variety of issues can delay the combustion of that gas. So the gas builds up in the furnace until BOOM it ignites, causing a mini-explosion. This can harm the heat exchanger, which is very expensive part to replace. Expanding air ducts It s no mystery that expanding metal ducts would cause a loud bang noise. But what causes it? Usually, too much static pressure in the ductwork. Static pressure is stationary pressure in a confined space (it s just like blowing air in a balloon).


In this case, there s too much pressure pushing on your ductwork, causing it to expand and make a BANG noise. Dirty air filter especially dirty, 1-inch pleated filters So what now? If the noise came from your ducts, change the air filter (if it s dirty). Also, open your supply vents and make sure they re not blocked by furniture or curtains. If that didn t work, call a professional to find the issue and fix it. Are you in our? We can help!. Did you find this article helpful? to get more how-to articles and money-saving tips sent to your inbox. You ll also receive a $25 gift card towards your first service. Ragsdale Heating, Air and Plumbing has been serving the metro Atlanta area for over 19 years. Contact us online for more information on how we can help you.

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