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Common Furnace Problems & What To Do Next

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As a homeowner, maintaining a comfortable and warm environment during the cold months is a top priority. Your furnace plays a crucial role in keeping your home cozy, but like any appliance, it can experience issues that may leave you shivering in the cold.

In this guide, we’ll explore:

  • The most common furnace problems
  • How you can identify them
  • What you can do to fix or prevent them

By understanding these furnace hiccups, you can ensure your heating system remains reliable and efficient all season long.

8 Furnace Problems To Watch Out For

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Wondering if your furnace problem is real or all in your head? Here are some signs that you might be dealing with a furnace problem.

1. Furnace Doesn’t Turn On

Perhaps one of the most frustrating issues is when your furnace simply won’t start. This problem can stem from several potential causes:

  • Thermostat Issues: A malfunctioning thermostat can be a primary reason your furnace won’t turn on. Ensure your thermostat is set to “heat” and the temperature is higher than the current room temperature. Additionally, check if the thermostat has fresh batteries and is functioning correctly.
  • Power Problems: A tripped circuit breaker or a blown fuse can cut power to your furnace. Check your home’s electrical panel to ensure everything is in order.
  • Pilot Light or Ignition Issues: Older furnaces with a pilot light may fail to start if the light goes out. For modern furnaces with electronic ignition, a faulty igniter can prevent the furnace from starting. In both cases, consulting a professional is recommended.

2. Insufficient Heat Production

If your furnace turns on but doesn’t produce enough heat, it can be due to several reasons:

  • Dirty Air Filters: Clogged air filters restrict airflow, causing the furnace to work harder and produce less heat. Replace or clean filters every 1-3 months to maintain optimal performance.
  • Blower Issues: The blower is responsible for distributing warm air throughout your home. If it’s not functioning properly, you may notice weak airflow and poor heating. A professional can inspect and repair or replace the blower motor if necessary.
  • Ductwork Leaks: Leaky ducts can result in a significant loss of heated air. Inspect your ductwork for any visible gaps or damage and seal them with duct tape or mastic sealant.

3. Short Cycling

Short cycling occurs when the furnace turns on and off repeatedly in short intervals. This problem not only wastes energy but can also lead to wear and tear on your furnace components.

  • Overheating Issues: A clogged filter or blocked vent can cause the furnace to overheat and shut down as a safety measure. Ensure all vents are open and unobstructed, and replace dirty filters promptly.
  • Thermostat Malfunctions: A faulty thermostat can misread the room temperature, causing the furnace to cycle improperly. Consider upgrading to a smart thermostat for more precise temperature control.
  • Oversized Furnace: An oversized furnace may heat your home too quickly, leading to short cycling. Consulting with an HVAC professional can help determine if your furnace is the right size for your home.

4. Unusual Noises

Unusual noises from your furnace can indicate underlying issues that need attention:

  • Banging or Popping Sounds: These noises may result from expanding and contracting air ducts or a dirty burner. Cleaning the burner and securing ductwork can often resolve these sounds.
  • Squealing or Whining Sounds: These noises are typically caused by a loose or worn-out belt or motor bearings. Lubricating the motor or replacing the belt can help eliminate these sounds.
  • Rattling Noises: Loose panels or components may cause rattling sounds. Tighten any loose screws and check for any parts that may have become dislodged.

5. Pilot Light or Ignition Control Problems

If your furnace’s pilot light is constantly going out or the electronic ignition isn’t working, you may face:

  • Pilot Light Issues: Drafts or a dirty thermocouple can extinguish the pilot light. Ensure there are no drafts near your furnace and clean the thermocouple gently if necessary.
  • Ignition System Failures: Modern furnaces use electronic ignitions, which can malfunction over time. A professional HVAC technician can diagnose and repair electronic ignition issues.

6. Blower Runs Continuously

If your blower fan runs non-stop, it could be due to:

  • Fan Switch Issues: A faulty fan limit switch can cause the blower to run continuously. A professional can test and replace the switch if needed.
  • Thermostat Settings: Ensure your thermostat’s fan setting is on “auto” rather than “on.” The “on” setting will keep the fan running continuously.

7. Furnace Leaks Water

Gas furnaces, particularly high-efficiency models, can sometimes leak water:

  • Condensation Issues: High-efficiency furnaces produce condensation, which should be drained properly. If the drainage system is clogged, water may leak from the furnace.
  • Humidifier Leaks: If your furnace has an attached humidifier, inspect it for leaks, as these can also lead to water accumulation around the furnace.

8. Lack of Regular Maintenance

Neglecting regular maintenance is a common cause of furnace problems. To ensure peak performance:

  • Schedule Annual Inspections: Regular inspections by an HVAC professional can identify potential issues before they become major problems.
  • Clean and Replace Filters: Regularly clean or replace air filters to maintain efficient airflow.
  • Check Vents and Ductwork: Periodically inspect your home’s vents and ductwork for blockages or leaks.

What to Do When Your Furnace is Broken

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When your furnace breaks down, especially during cold weather, it can be a stressful situation. Here are some steps to take immediately to restore warmth and comfort to your home:

  • Check for Obvious Issues: Before calling a professional, check if simple issues like a tripped circuit breaker, thermostat setting, or blocked vents can be the source of the problem.
  • Use Alternative Heating Sources: Temporarily rely on space heaters or portable heating devices to warm key areas of your home. Ensure these devices are used safely, with proper ventilation and clear space around them to prevent fire hazards.
  • Wear Warm Clothing and Use Blankets: Dress in layers and use blankets to stay warm. Focus on keeping body heat by covering exposed areas such as the head and feet.
  • Prevent Pipe Freezing: If your furnace is broken for an extended period, keep faucets dripping slightly to prevent pipes from freezing and bursting due to lack of heat.
  • Call an HVAC Professional: If the issue persists and cannot be resolved with simple troubleshooting, contact a licensed HVAC technician. They can diagnose and fix more complex issues efficiently.
  • Consider Emergency Services: In cases of extreme cold or if vulnerable individuals (such as elderly family members or small children) are present, explore emergency services or stay with family or friends until the furnace is back in operation.

Ensuring a proactive approach to addressing furnace issues can help minimize discomfort and prevent more serious problems down the line. Regular maintenance can also prevent breakdowns and extend the life of your furnace.

A Furnace Repair Technician You Can Count On

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Understanding and addressing common furnace problems can keep your heating system running smoothly and efficiently. While some issues can be resolved with DIY solutions, others may require the expertise of a professional HVAC technician.

If you’re experiencing persistent issues or need expert assistance, reach out to a trusted HVAC professional at Genz-Ryan who can provide tailored solutions for your specific needs. Fill out our contact form today to get started!

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