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Delayed ignition is when that gas isn't ignited immediately, allowing the gas to build up in the furnace. The gas keeps building until—BOOM—it reaches a flame and finally ignites, causing a small explosion in your furnace. Too much primary air makes the gas-air mixture hard to light, causing gas to build up.
Beside this, what happens when a furnace explodes?
Although it is possible for a gas furnace to either catch fire or explode, it's highly unlikely. If there is a danger of this happening, the furnace will usually simply shut off—as it's designed to. If you've got a good furnace and take care of it, you won't have to worry about explosions or fires.
Besides, can a furnace catch fire?
A house fire is often the most likely consequence of using a faulty or unmaintained furnace. Since it is a very volatile substance, it can easily explode and cause a fire in the home. Even if an explosion does not occur, the excess gas in the air can cause people to become sick.
An oil-burning furnace with a leaky seal may throw improperly atomized oil into the furnace's combustion chamber, which eventually pools at the bottom of the chamber. The pools partially vaporize. They ignite when the furnace cycles on, causing an explosion.