Does your gas furnace produce a loud bang that sounds like a mini explosion each time the heating system fires up? If so, a delayed ignition could be the problem. The noise can be unsettling, but knowing how to fix a delayed ignition in a gas furnace will prevent the situation and keep your system safe and operational.
As a trusted HVAC company in the Hamptons, New York, the Complete Comfort Control technicians are here to explain why a gas furnace could experience an ignition delay and what you can do about it.
Why Gas Furnaces Experience Delayed Ignition
A delayed ignition in a gas furnace sounds like a loud explosion but without noticeable smoke and fire. It usually occurs when you turn on the heater after a long period of inactivity. The problem comes from too much gas inside the combustion chamber, but other situations can create this problem in your HVAC system.
1. Excess Moisture
In the spring or fall, when you’re less likely to use your furnace daily, moisture will accumulate inside the furnace. This moisture buildup leads to firebox corrosion that could restrict how much gas the burners get from the gas-feeding ports. As a result, the burners will need more time to ignite, which will cause a delayed ignition.
2. Dust and Lint Accumulation
Gas furnaces can also collect dust, lint, and other debris over time. Debris buildup can block the ports and cause difficulty for the burners that need to ignite when the furnace kicks on. If you don’t regularly clean your furnace as part of its maintenance, dust will become a major problem for the system’s operations.
3. Sulfur Buildup
When you burn natural gas as fuel, it can create sulfur as a byproduct. When too much sulfur collects around the pilot light, it could lead to a delayed ignition. You can tell sulfur is the root of your problem if you see a white dusting around the pilot light.
4. Ignition Issues
Though gas furnaces burn natural gas as fuel, they may also use electronic ignitors to facilitate the combustion process. A delayed ignition is possible if the chamber has combustion gas buildup due to a malfunctioning ignitor.
Typically, furnaces have safety features like sensors to prevent potentially dangerous situations from forming. For example, a sensor might detect the wrong gas level or pressure inside the combustion chamber and shut down the furnace as a response. Still, you might need a new ignitor if yours doesn’t immediately turn on and shut off when necessary to avoid a gas buildup.
Avoid a Delayed Ignition With Professional Help
If you ignore the loud bangs and allow your furnace to continue delaying its ignition, you risk having the mini explosions shaking the furnace stack pipe loose. If this happens, you’ll have hazardous soot particles throughout your home.
The delayed ignition could also cause damage to the heat exchanger, resulting in a costly heating system replacement. The gas buildup could also cause a fire or a real explosion.
The key to fixing delayed ignitions in gas furnaces is prevention. Thankfully, you can prevent these serious problems by scheduling annual furnace maintenance with a qualified HVAC company. Furnace technicians follow these steps to minimize the chances of the furnace having a late ignition:
- Clean the furnace’s surfaces: The technician will use a soft, damp cloth to remove dirt and grime from the outside of the furnace. They’ll also clean the bottom of the unit and its burners with a vacuum.
- Clean all components: After wiping down and vacuuming the furnace, the technician will clean the furnace’s components. Cleaning the blower, pilot light, ignitor, and flame sensor will eliminate dust and lint that could cause clogs.
- Apply lubrication to moving parts: When everything is clean and dust-free, some components will get a small amount of lubrication oil to prevent friction and premature wear. The technician will pay close attention to the blower motor and shaft bearings.
- Replace the air filter: The last step is air filter replacement. You can do this once every three months to remove excess dust in your home.
Get Reliable Furnace Repair in the Hamptons Today
Even if you know how to fix a delayed ignition in a gas furnace, count on Complete Comfort Control and our expert HVAC technicians to handle all your heating repair needs. We offer comprehensive HVAC services to residents of the Hamptons, New York, including system repairs, installations, and modern upgrades. Our skilled technicians work on all furnace brands but specialize in respected brands like Daiken and Mitsubishi.
Call (631) 910-7649 to request an appointment with Complete Comfort Control.