Nobody enjoys going into a dark basement when there are frightening sounds coming from the gas furnace. Here are some likely sounds that might be making the noise. If you hear a loud ‘boom’, it’s usually caused by a delayed ignition. An Heating, Ventilation, as well as A/C corporation should be called instantaneously since the cause could be an explosion from gas building up in the gas furnace chamber. The same sound occurs when too much gas builds up when lighting a gas grill. There are numerous explanations for why ignition is delayed in a gas gas furnace. One is that there is a high air-to-gas ratio, making the ignitor hard to light. Another cause might be insufficient amounts of gas due to low gas pressure. Finally, the burners could be clogged with debris, worn down, or otherwise compromised. Another sound coming from the gas furnace is more enjoy a house-shaking rumble as the gas furnace completes 1 of its heat cycles. This cause is absolutely due to the fact that oil continues to burn in the combustion chamber after the burners shut off. Again, call a certified Heating, Ventilation, as well as A/C repairman instantaneously. This concern can lead to carbon monoxide gas being released into the home, which is deadly. If the gas furnace makes a loud rattle when it clicks on, carbon monoxide could also be the culprit. The gas furnace may have a cracked heat exchanger, which is the biggest cause of carbon monoxide leaks. Next are squealing or grinding noises, the cause which more than likely is a loose blower belt. Or, the motor bearings could be failing as well as need to be replaced or oiled. A clicking noise is normal when a gas furnace first turns on, which is from the ignitor. Finally, a buzzing noise is absolutely the result of something that’s loose in the gas furnace transformer.