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Why Isn't My Heat Turning On? Troubleshooting Tips for Your HVAC System

Updated: Feb 8

Few things are more frustrating than expecting warmth from your HVAC system only to find it unresponsive. If you're asking, "Why isn't my heat turning on?" fear not, as this blog post will guide you through common issues and troubleshooting tips to restore comfort to your home.

1. Check the Thermostat

Start with the basics. Ensure your thermostat is set to the desired temperature and in the heating mode. Sometimes, the issue may be as simple as a low battery in your thermostat, so replace them if needed. If you have a programmable thermostat, verify that the programmed schedule aligns with your preferences.

2. Inspect the Circuit Breaker

A tripped circuit breaker could be the reason behind your cold home. Check your electrical panel for any tripped breakers and reset them. If the breaker continues to trip, it may indicate an electrical issue that requires professional attention.

3. Examine the Pilot Light

Most newer gas-powered HVAC systems no longer have a pilot light, but for some older gas-powered HVAC systems, a malfunctioning pilot light can be the culprit. If your pilot light is out, follow the manufacturer's instructions to relight it. If it won't stay lit or the flame is an unusual color, contact a professional technician to address the issue.

4. Replace or Clean the Air Filter

A dirty or clogged air filter restricts airflow, making your system work harder and potentially causing it to overheat. Check your air filter and replace it if it's dirty. For reusable filters, clean them according to the manufacturer's instructions.

5. Inspect the Thermostat Wiring

Loose or damaged thermostat wiring can disrupt communication between your thermostat and HVAC system. Carefully inspect the wires for any issues, and if you notice problems, call in a professional to address the wiring.

6. Check the Gas Supply

If you have a gas furnace, ensure the gas supply is uninterrupted. If you suspect a gas leak, evacuate your home immediately and contact your gas provider and emergency services. Gas-related issues require immediate professional attention.

7. Verify the Ductwork

Inspect your ductwork for any leaks or blockages. Damaged or poorly connected ducts can compromise the efficiency of your heating system. Seal any leaks with duct tape or contact a professional for repairs.

8. Schedule Professional Maintenance

Regular professional maintenance is key to preventing heating issues. If you can't identify the problem or if issues persist after your troubleshooting attempts, it's time to call an HVAC technician. They can conduct a thorough inspection, identify hidden issues, and perform any necessary repairs.


When your heat isn't turning on, troubleshooting can often identify and resolve the issue. However, if you're unable to diagnose the problem or if it persists, seeking professional help is crucial. At Lyndon Heating and Air, our skilled technicians are ready to assist you, ensuring your home stays warm and comfortable throughout the colder months. Don't let heating issues leave you in the cold – reach out to us for expert HVAC service. Call (252) 991-5867 or email us at

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