Knowing when to replace your furnace gas valve is an essential part of keeping your home safe, cozy and energy smart. The gas valve is an often under appreciated part of your heating system—but without it, your furnace can’t function.

In this blog, Joel's Heating and Cooling will break down the key signs of a bad gas valve. Whether you’re dealing with issues or just want more information about how a furnace works, this guide for Plainfield, Illinois, homeowners will help you recognize the need for furnace gas valve replacement—and when to contact the professionals at Joel's Heating and Cooling.

What is a Furnace Gas Valve and What Does It Do?

To start, it's important to know what a furnace gas valve is and what it is responsible for. The furnace gas valve manages the flow of natural gas or propane into the unit's burner assembly, providing the fuel necessary for the combustion process to occur and make heat. If gas flow is blocked, a gas-powered furnace can't make any heat.

Also a key safety feature, the furnace gas valve is designed to shut if a problem is detected—preventing a potentially deadly gas leak. A typical furnace gas valve lifespan is about 10–20 years. Although replacement price depends on the kind of furnace and if any other components need fixing, replacing a furnace gas valve costs an average of roughly $300–800.

The Furnace Won't Light

One of the signs it could be time to replace your furnace gas valve is if the furnace is not igniting or if the pilot light won't light. Gas provides fuel for the flame. Without enough gas flow through the system, a furnace won’t start up. Sometimes, homeowners also report that the igniter clicks but there's no flame.

However, a furnace not igniting or a pilot light that won't light or stay lit can sometimes be symptoms of  other mechanical breakdowns, such as a damaged sensor, an issue with the thermocouple or insufficient fuel supply. If you notice these signs, it's important to contact a certified HVAC technician for an inspection. They'll professionally diagnose whether the problem a thermocouple vs gas valve issue, or if there's another reason the furnace won't ignite.

Gas Smell Coming from Furnace

One clear sign of a broken furnace gas valve is a gas smell in your residence. This isn’t just a furnace maintenance issue—it’s an emergency. A gas leak can cause a fire, explosion or even carbon monoxide poisoning. If you smell gas, evacuate the home immediately, call your gas company or 911, and then contact Joel's Heating and Cooling for emergency furnace repair.

Furnace Keeps Short Cycling

Faulty gas valve symptoms also include short cycling. Short cycling is when a furnace starts, but then quickly stops instead of going through its full cycle. This is because a faulty furnace gas valve can produce inconsistent gas flow. The valve malfunction also could trigger your furnace to turn off to avoid creating a gas leak.

That said, sometimes furnace short cycling has other causes, so it's important to seek out a qualified heating expert for evaluation and possible furnace repair. 

What to Do When Your Furnace Gas Valve Isn't Working?

If you believe your furnace gas valve isn’t working properly, it’s critical to take the situation seriously.

First, turn off the gas supply to prevent any further risk, then shut down your furnace. Don’t try to repair the valve without a professional. DIY gas valve repair can create a deadly gas leak if not done right and also may void your warranty and gas valve coverage. Whether the gas valve is stuck open, closed or malfunctioning in some other way—gas valve repair isn’t a task for someone without specialized tools and training. In addition, when it comes to comparing options between gas valve repair and gas valve replacement, it's almost always recommended to replace a gas valve instead of repairing it. 

Call Joel's Heating and Cooling to Be Sure Your Furnace is Ready for the Plainfield, Illinois, Cold

To replace your furnace gas valve safely, contact the professional Plainfield, Illinois, HVAC company—Joel's Heating and Cooling. Our trained technicians know exactly what to do when it comes to gas valve troubleshooting. We'll pinpoint what's wrong, perform the gas valve replacement safely and make sure your furnace is running at peak performance. To save even more power, we can even match your system with one of our smart thermostats or offer furnace installation service to help you replace your outdated heating system.

Don’t put your home at risk. Call 815-556-1046 today for gas valve replacement services from Joel's Heating and Cooling.