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When the cold weather hits, the last thing you want is for your furnace to stop working. If your furnace won’t start, it can be frustrating, but don’t panic just yet! There are a few simple reasons your furnace might not be kicking on, and many of them can be easily diagnosed with some basic troubleshooting. However, if the issue persists, it’s important to remember that some problems require professional furnace repair in Dover, KY. In this blog, we’ll walk you through common reasons your gas furnace won’t start, simple steps to troubleshoot, and when it’s time to call in the experts.
Common Reasons Your Furnace Won’t Start
Thermostat Issues
Before diving into more complex problems, check your thermostat settings. This might sound obvious, but it’s a step many people overlook. Sometimes, a thermostat may accidentally be switched to “off” or set to an inappropriate temperature. Also, make sure the thermostat is set to “heat” mode rather than “cool” or “auto.”
Power Supply Problems
A furnace requires power to function, even a gas furnace, and one of the first things you should check is the power supply. Ensure the furnace is plugged in and that the circuit breaker hasn’t tripped. If the breaker has been tripped, flip it back to the “on” position, and try starting the furnace again. If the breaker trips again, there could be an underlying electrical issue, and it’s time to contact a professional HVAC contractor.
Dirty Air Filter
A clogged air filter is a common culprit when it comes to furnace malfunctions. A dirty air filter restricts airflow, causing the furnace to overheat and shut down as a safety precaution. Replacing or cleaning the air filter should be part of your regular furnace maintenance, but if you haven’t done it recently, it could be the reason your furnace won’t start. Make sure to check the filter and replace it if necessary.
Ignition Issues
If your furnace is not igniting, there may be a problem with the ignition system, such as a malfunctioning igniter or a gas valve issue. These issues can be difficult to troubleshoot without professional expertise, so it’s best to call an HVAC technician if you suspect the ignition system is the problem.
Gas Supply Issues
A gas furnace needs a steady supply of gas to operate. If your furnace is powered by natural gas, ensure that the gas valve is turned on. You can check this by inspecting the valve near the furnace; if it’s in the “off” position, turn it to “on.” If the valve is already on, but the furnace still won’t start, you may be dealing with a gas line issue or a malfunctioning valve, which requires professional repair.
Tripped Limit Switch
The limit switch in your furnace is a safety feature that shuts down the furnace if it gets too hot to prevent a fire. If your furnace is overheating due to poor airflow or another issue, the limit switch may have been tripped. This can often be fixed by addressing the underlying cause of the overheating, such as replacing the air filter or checking the blower fan. However, if the limit switch continues to trip, it could indicate a more significant issue.
When to Call a Professional
While there are several simple things you can check when your furnace won’t start, some problems require professional intervention. If you’ve tried troubleshooting the common issues listed above, but your furnace still won’t start, it’s time to call us. Our team of experts is ready to get your furnace up and running again to keep you warm all winter long.