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Why Is My Furnace Not Turning On?

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As the cold months of winter approach, a well-functioning furnace becomes an essential part of your home. It ensures you and your family stay warm and comfortable during the chilly season. However, there’s nothing more frustrating than discovering that your furnace is not turning on when you need it the most. 

In this blog, we will explore the most common reasons why your furnace may fail to start and offer troubleshooting tips to help you identify and address the issue:

Hopefully, you can often identify the root cause of the problem and take the necessary steps to get your furnace up and running. However, if the issue persists and you’re unsure about what to do next, seek the assistance of a professional HVAC technician. Regular maintenance and prompt repairs will ensure your furnace’s reliability and extend its lifespan.

Don’t let a malfunctioning furnace leave you in the cold. Call the Cooper Green Team today!

Contact us for furnace repairs and experience the outstanding service that’s made us a top-rated HVAC contractor throughout Colorado. We offer fast response times, highly-trained technicians, and upfront and honest pricing. Call (720) 605‑7270 or click below to schedule online today.

Thermostat Issues

One of the most common reasons your furnace may not be turning on is thermostat problems. The thermostat is the control center for your heating system, and if it’s not functioning correctly, your furnace won’t receive the signal to start. Here are a few thermostat-related issues to consider:

  • Incorrect Settings: Double-check the thermostat settings. Ensure it’s set to heat” mode and the temperature is higher than the current room temperature. If your thermostat is programable, Be sure to check the programmed settings to make sure they set property.
  • Dead Batteries: If your thermostat is battery-operated, low or dead batteries can cause it to malfunction. Replace the batteries and see if the furnace starts.
  • Dust and Dirt: Dust and dirt buildup in the thermostat can disrupt its operation. Clean the thermostat by removing the cover and gently brushing away any debris.
  • Wiring Problems: Examine the wiring of your thermostat. Loose or damaged wires can prevent the furnace from receiving the necessary signals. If you’re not comfortable with this, consult a professional.

If your thermostat is continuously having issues, consider replacing it with a smart thermostat. To learn more, check out our blog, The Surprising Benefits of a Smart Thermostat for Your Home.”

Circuit Breaker Issues

A tripped circuit breaker can be another reason for a malfunctioning furnace, disrupting the power supply as furnaces are connected to the home’s electrical system. To address this, locate your home’s electrical panel, check for tripped breakers, and reset any tripped ones by switching them off and then on. However, if the breaker keeps tripping, it may indicate a more significant electrical problem, requiring the expertise of an electrician for further inspection.

Dirty or Clogged Air Filters

Air filters are essential for proper furnace operation, as they filter out dust and debris from incoming air. Over time, these filters can clog, reducing airflow and triggering the furnace’s safety shutdown mechanism. To tackle this problem, locate your furnace’s air filter near the blower motor, remove and inspect it, and replace it with a new one if it’s dirty or clogged. Typically, furnace filters should be replaced every one to three months, depending on usage and filter type, ensuring the furnace’s smooth operation and improved indoor air quality.

Pilot Light or Ignition Problems

In gas furnaces, the pilot light or ignition system is crucial for igniting the fuel and generating heat. A malfunctioning pilot light or ignition system can cause the furnace to fail to start. To address this issue, first, ensure that the pilot light is lit, following the manufacturer’s instructions for relighting it if necessary. Alternatively, if your furnace has an electronic ignition system and you suspect a problem, attempt to reset it by turning the furnace off and back on after a few minutes. If these steps don’t resolve the issue, it’s advisable to contact a licensed HVAC technician for professional inspection and repairs.

Fuel Supply Problems

For oil or propane furnaces, fuel shortages can hinder startup. To address this issue, verify that your fuel tank isn’t empty and schedule a refill if needed. Next, check for fuel line leaks or clogs and enlist the expertise of a professional technician to resolve any fuel supply system problems.

Blocked Vents or Exhaust Pipes

Proper ventilation and combustion in furnaces depend on clear exhaust pipes and intake vents. Blockages in these components can prevent the furnace from turning on due to safety risks. To address this, inspect and remove any obstructions like snow or debris, ensure no household objects obstruct the vents, and seek professional HVAC technician assistance if you suspect exhaust system issues.

Need furnace repairs fast? Call the Cooper Green Team!

When your furnace breaks down, you can’t afford to wait – and with Cooper, you won’t have to. Our highly-trained technicians are ready to swoop in and bring the heat back to your home, ensuring your family’s comfort and safety. Call us at (720) 605‑7270 or schedule online below, and we’ll provide a swift, 5‑star furnace repair experience.