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Nothing is more frustrating than powering up your furnace, but it won’t heat up your home. Whether it’s blowing cold air through the vents or the system is not responding at all, you’ll know there’s a problem. Having a faulty furnace during winter is the last thing you want to deal with.

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There are several culprits behind no heat from a furnace, including a dirty filter, an incorrect thermostat setting, a failed ignition, and many more. Some of these problems can be DIY fixes, but there are more complicated issues that should be handled by a licensed HVAC company. Below, we look at what to check before scheduling HVAC service.

Check the Thermostat

Start with the thermostat, as it’s often the simplest fix. Make sure it’s set to “Heat” and not “Cool” or “Off.” Confirm that the temperature setting is higher than the current room temperature. If your thermostat runs on batteries, replace them—even if the display is still on. Weak batteries can cause communication issues with your heating system. If you have a programmable thermostat, double-check the schedule. It’s possible the programmed settings are lowering the temperature at certain times of the day.

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Inspect the Circuit Breaker

Your heating system relies on electrical components, even if you have a gas furnace. Head to your electrical panel and look for a tripped breaker labeled “Furnace,” “Air Handler,” or “HVAC.” If it’s tripped, reset it once. If it trips again immediately, do not continue resetting it—this indicates a deeper electrical issue that requires professional attention. Call a local company that specializes in furnace repair to find the root of the problem and carry out repairs.

Airflow and Safety Checks

The furnace is equipped with an air filter that protects the system from debris like dust, pet dander, and lint. If the filter gets severely clogged, the furnace can overheat and shut down. A clogged air filter may also cause weak airflow from vents and uneven heating. Thankfully, replacing a clogged air filter is a simple DIY task that should take about 5 minutes. Turn off the furnace, slide out the filter, and insert a new one with the arrows pointing toward the furnace.

Blocked vents can also be the reason why there’s no heat coming from the system. If your furnace shuts down shortly after turning on, there’s a good chance you’re dealing with blocked vents. Everything from animal nests to snow and debris can obstruct the vents, causing a wide range of problems.  You should check the exterior vent pipes every month, particularly after snowstorms and windstorms. If you need help with unclogging blocked vents, call a local HVAC service.

Fuel and Ignition System

Gas supply problems, such as a closed valve or an interrupted supply, can stop the burners from producing heat. Ensure the gas supply line is turned on before you call an HVAC company. If your furnace uses a standing pilot light, check if it has gone out and relight it according to the manufacturer's instructions. For modern models that rely on electronic ignition, listen to clicking when you turn on the system. If it doesn’t spark or glow, call a heating repair technician to diagnose the issue.

No Heat? Contact The Heating Experts at Service Hero

When your furnace breaks down and you need professional help, you want to call a trusted HVAC company. Service Hero has diagnosed and resolved all kinds of heating problems, from no heat to ignition problems and short cycling. Our skilled and experienced technicians have the professional expertise and experience to service both traditional and modern heating systems. Contact us now to schedule furnace repair service.

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