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Why Won’t My Furnace Turn On?

When winter’s chill hits, a malfunctioning furnace can quickly turn from a minor annoyance to a significant concern. Are you currently asking yourself, “Why won’t my furnace turn on?” If so, it’s understandable if you’re worried. However, you’re not alone in your distress. Many homeowners experience similar issues, and understanding why your furnace won’t turn on is the first step toward a solution. In this blog, we’ll explore common reasons behind a furnace not working and offer troubleshooting tips.

Thermostat Issues

A common reason why your furnace won’t turn on is due to improper thermostat settings. Ensure your thermostat is set to “heat” and the desired temperature is higher than the current room temperature. Sometimes, simply replacing the batteries or checking for loose connections can resolve the issue.

Tripped Circuit Breaker

If your furnace is not working, you may want to take a closer look at the breaker box. Your furnace is connected to your home’s electrical system, and a tripped circuit breaker can prevent it from turning on. Check your home’s breaker box and reset any tripped circuit breakers. This could restore power to your heating system and get it running again.

Dirty or Clogged Air Filters

Did you know that the air filter can play a role in why your furnace is not working? It’s a small but mighty component of your heating system that requires routine attention. A dirty air filter can restrict airflow, causing your furnace to overheat and shut down as a safety feature. Regularly changing your furnace filter can prevent this problem and maintain sufficient airflow for your heating system to function properly.

Issues With the Pilot Light or Ignition Sensor

Older gas furnaces rely on a pilot light, which can go out, preventing the furnace from turning on. Modern furnaces use an ignition sensor, which can also malfunction. In both cases, the furnace won’t turn on if these components are not working properly.

Gas Supply Problems

For a gas furnace, issues with the gas line or gas valve can prevent it from turning on. Ensure the gas valve is open and check other gas appliances in your home to rule out a broader gas supply problem.

Faulty Flame Sensor or Blower Motor

A dirty or faulty flame sensor can prevent the furnace from igniting, while issues with the blower motor can stop the distribution of warm air. These components may require cleaning or replacement by a professional HVAC technician.

Overloaded Furnace

Continuous use without proper maintenance can lead to an overloaded furnace. If your furnace won’t turn on, it may have a safety switch that has been triggered. During a service call, a professional can accurately diagnose and reset the system.

Malfunctioning Heat Exchanger

The heat exchanger is vital for heating the air in your HVAC system. If it’s damaged or malfunctioning, the furnace won’t turn on as a safety precaution. This issue often requires professional furnace repair. So, if you think your furnace is not working because of an issue with the heat exchanger, don’t hesitate to call an experienced technician for assistance.

Keeping Your Furnace Running Smoothly

Understanding why your furnace won’t turn on is crucial for a comfortable and warm home during cold seasons. From checking the thermostat to ensuring proper gas supply, these troubleshooting tips can help you identify common furnace problems. However, for complex issues or regular maintenance, it’s always best to consult HVAC experts.

Contact Our Heating Specialists Today!

Whether you’re experiencing persistent furnace issues or need a new heating system, Johnson & Johnson Heating and Air Conditioning is here to help. We offer a wide range of services, from heater maintenance services and furnace installation to residents in Frederick, MD, Martinsburg, WV, and the surrounding areas.
If your furnace is not working properly, don’t wait to give our team of professionals a call. Contact us today to ensure your furnace is ready to keep your home warm and cozy all winter long!

A woman in bed looking cold and rubbing her hands together with a blanket around her.

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