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Furnace Failure Symptoms You Should Never Ignore

February 5, 2025

When your air conditioner suddenly stops keeping your home cool, it’s not just an inconvenience—it can disrupt your entire day, especially during Indiana’s and Lower Michigan’s hot and humid summer months. While some HVAC issues require professional repair, many common problems start small and can be caught early with a little know-how.

In this air conditioning system troubleshooting guide, we’ll walk you through the most frequent repair issues homeowners face, how to identify them, and when it’s time to call in the experts. Whether you’re a DIY-savvy homeowner or simply looking to stay informed, this guide helps you recognize warning signs and understand what your system is telling you.

1. Your AC Isn’t Cooling Properly

Possible Causes:

  • Dirty Air Filter: One of the most overlooked culprits. A clogged filter restricts airflow, reducing system efficiency and cooling capacity.
  • Thermostat Issues: If your thermostat isn’t working correctly, has dead or weak batteries, or is placed in direct sunlight, it may misread the indoor temperature and cause your AC to run inefficiently.
  • Low Refrigerant Levels: A refrigerant leak can prevent your system from absorbing enough heat from your home.

Troubleshooting Tips:

  • Check and replace your air filter monthly during peak cooling seasons.
  • Make sure your thermostat is set to “cool” and placed away from heat sources.
  • If air is blowing but not cold, contact a professional to check for refrigerant leaks—this requires handling by an EPA-certified technician, and all of Goff’s service experts meet this certification standard.

⚠️ Refrigerant Handling Warning:

Federal law prohibits anyone without proper EPA Section 608 Certification from handling refrigerants like R-410A. This includes checking, refilling, or repairing refrigerant lines. Improper handling not only poses serious health and safety risks—including frostbite, respiratory issues, or chemical burns—but can also damage your AC system and violate environmental regulations.

All Goff Heating and Air Conditioning service technicians are certified and trained to safely handle refrigerants in compliance with EPA standards. If you suspect a refrigerant leak or your system isn’t cooling properly, call our team for professional service you can trust.

2. AC Won’t Turn On

Possible Causes:

  • Tripped Circuit Breaker: Power surges can trip the breaker connected to your AC unit.
  • Blown Fuse or Faulty Wiring: Electrical issues can prevent the system from powering on.
  • Thermostat Malfunction: A dead battery or misconfigured settings can prevent startup.

Troubleshooting Tips:

  • Reset your circuit breaker and see if the system powers up.
  • Replace the thermostat batteries and double-check your settings.
  • If your system still doesn’t respond, schedule a diagnostic service with a licensed HVAC technician.

3. Strange Noises from Your AC

Common Sounds and What They Mean:

  • Banging or Clanking: Could indicate a loose or broken part, such as a connecting rod or piston.
  • Buzzing: Often signals electrical issues or a failing motor.
  • Squealing: Worn-out fan belts or motor bearings are usually to blame.

Troubleshooting Tips:

  • Turn off your system immediately if you hear banging or grinding to avoid further damage.
  • Schedule a repair visit to have internal components inspected.

4. Water Leaks or Excess Moisture

Possible Causes:

  • Clogged Condensate Drain Line: Dirt and debris can block the drain, causing water to back up into your home.
  • Frozen Evaporator Coil: Low refrigerant or airflow issues can cause the coil to freeze and melt.

Troubleshooting Tips:

  • Clear any visible debris near the drain line or pan.
  • If the leak persists or ice is present, it’s time to contact Goff Heating and Air Conditioning for service.

5. Weak Airflow

Common Causes:

  • Ductwork Leaks: Air may be escaping through cracks or disconnections in your ductwork.
  • Fan Issues: The blower fan may be dirty or malfunctioning.
  • Aging System: Older units naturally lose efficiency over time.

Troubleshooting Tips:

  • Replace air filters and check vents for obstructions.
  • Have your ductwork inspected as part of your bi-annual GoffCare Maintenance Membership.

6. Frequent Cycling On and Off

Potential Causes:

  • Oversized System: An AC that’s too large for your home will short cycle.
  • Dirty Components: Dirty filters or coils make your system work harder and cycle more often.
  • Thermostat Problems: Faulty sensors may misread indoor temps.

Troubleshooting Tips:

  • Clean your unit regularly or sign up for a GoffCare Membership for professional tune-ups.
  • Contact a Goff technician to evaluate if your system is properly sized for your home.

7. High Energy Bills

Why It Happens:

  • Inefficient Equipment: Older AC units draw more power to deliver the same performance.
  • Poor Maintenance: Dirty coils, clogged filters, and low refrigerant reduce efficiency.
  • Leaky Ducts: Up to 30% of cooled air can escape through leaks.

Troubleshooting Tips:

  • Schedule an energy audit or performance check.
  • Consider upgrading to a high-efficiency Bryant system installed by Goff, a Bryant Factory Authorized Dealer and 2024 Circle of Champions award recipient.

8. Electrical Component Failures

Common Issues:

  • Capacitors Out of Spec: The capacitor is like a battery that helps your AC motor start and run efficiently. Over time, it can degrade or go out of spec, causing your system to struggle or fail to start altogether.
  • Failing Contactors: Contactors are electrical switches that control the flow of electricity to your system’s components. When they wear out, you might notice a humming sound, intermittent operation, or the unit not turning on at all.

⚠️ Important Safety Warning:

We strongly advise homeowners not to attempt to test or replace capacitors or contactors on their own. These components store high voltage and can deliver dangerous electric shocks, even when the system is powered off. This work should only be performed by trained HVAC professionals—like our skilled technicians at Goff Heating and Air Conditioning.

Troubleshooting Tips:

  • If your AC isn’t starting, is making unusual clicking or humming noises, or is randomly shutting down, it’s likely time for a professional inspection.
  • Goff’s technicians are equipped to safely test and replace these critical electrical components, getting your system back up and running fast.

Prevent Common Repairs with GoffCare

A majority of AC repairs stem from poor maintenance. That’s why Goff Heating and Air Conditioning offers the GoffCare Maintenance Membership, designed to prevent breakdowns before they happen.

GoffCare Membership Benefits:

  • Bi-Annual HVAC Tune-Ups
  • 24-Hour Priority Service
  • Exclusive Discounts on HVAC Repairs
  • Extended Equipment Life

With GoffCare, you’ll stay one step ahead of unexpected repairs—and enjoy peace of mind all year long.

When to Call a Professional

While simple tasks like changing filters and checking your thermostat can be DIY-friendly, anything involving refrigerant, electrical components, or internal parts should always be handled by certified professionals.

At Goff Heating and Air Conditioning, we’ve proudly served South Bend and the surrounding communities since 1937. With over 85 years of experience, we’ve seen—and fixed—it all. Our licensed technicians are trained to diagnose and repair systems quickly, keeping your home cool and comfortable.

Final Thoughts: Know the Signs, Stay Cool

Understanding the early warning signs of air conditioning issues helps prevent small problems from becoming major repairs. Whether it’s a mysterious noise, reduced airflow, or rising energy bills, early intervention is key.

Use this Air Conditioning System Troubleshooting Guide to identify common repair issues—and trust Goff Heating and Air Conditioning to take care of the rest.

Ready to Schedule a Service or Learn More About GoffCare?

Give us a call today or schedule your free consultation online. Our team is here to deliver the Quality You Trust. Service You Deserve. Since 1937.

As a homeowner, staying warm during frigid winters in Michiana is essential. Your furnace plays a vital role in keeping your family cozy and safe. However, furnaces don’t last forever, and identifying potential problems early can save you from costly repairs—or worse, a complete breakdown. This guide will walk you through common furnace failure warning signs, show you how to identify furnace problems, and help you recognize symptoms of a malfunctioning furnace before it’s too late.

1. Strange Noises Coming from Your Furnace

Unusual sounds like banging, rattling, or squealing are clear furnace failure warning signs. These noises may indicate loose components, motor issues, or even a cracked heat exchanger. If you hear these sounds, it’s time to call an HVAC professional before the problem worsens.

  • Banging or Popping: Delayed ignition in burners.
  • HighPitched Squealing: Worn-out blower belts or motor bearings.
  • Rattling: Loose panels or internal components.

Recognizing symptoms of a malfunctioning furnace like these can prevent small issues from escalating into major repairs.

2. Uneven Heating and Cold Spots

Is one room in your home chilly while another feels like a sauna? Uneven heating is a common furnace failure warning sign. It could indicate:

  • A failing blower motor.
  • Blocked or clogged air filters.
  • Problems with ductwork or poor insulation.

Knowing how to identify furnace problems like inconsistent heating can save money and ensure your home stays cozy. Regular filter changes and sealing ductwork can make a big difference.

3. Unexpectedly High Energy Bills

Have your utility bills spiked unexpectedly? A malfunctioning furnace often struggles to operate efficiently, leading to higher energy consumption.

Potential Causes:

  • Dirty burners or clogged filters.
  • An aging system working harder than it should.
  • Thermostat issues causing constant adjustments.

Recognizing symptoms of a malfunctioning furnace like these can help you address inefficiencies before they drain your wallet. Schedule routine maintenance to keep your energy bills under control.

4. Short Cycling: Frequent On and Off

Does your furnace turn on and off repeatedly? This issue, known as short cycling, is a significant symptom of a malfunctioning furnace. Causes may include:

  • Dirty Filters: Restrict airflow.
  • Thermostat Malfunctions: Send incorrect signals.
  • Improper Sizing: A furnace too large or small for your home.

Short cycling not only affects comfort but also increases wear and tear on your system, leading to costly repairs if left unchecked. Understanding how to identify furnace problems related to short cycling can prevent unnecessary expenses.

5. Declining Indoor Air Quality

Do you notice more dust, static electricity, or dry skin during winter? Your furnace may be affecting your home’s air quality.

 

Common Issues:

  • Aging systems that fail to maintain humidity levels.
  • Circulation of allergens, dust, and pollutants.

 

Consider upgrading to a modern system or adding a wholehome humidifier to improve comfort and health. Addressing these symptoms of a malfunctioning furnace can ensure a healthier indoor environment.

6. An Aging Furnace

Furnaces typically last 15 years on average. If yours is nearing the end of its lifespan, you’re likely to encounter:

  • Frequent breakdowns.
  • Reduced efficiency.
  • Increased energy bills.

Regular maintenance can extend your furnace’s life, but it’s essential to plan for a replacement when repairs become too frequent or costly. Being proactive about furnace failure warning signs can save you money and stress.

7. Thermostat Troubles

Your thermostat is the control center of your heating system. Symptoms of a malfunctioning thermostat include:

  • Incorrect temperature readings.
  • Delayed responses.
  • Uneven heating cycles.

Upgrading to a programmable or smart thermostat can improve efficiency and give you more control over your home’s comfort. Learning how to identify furnace problems through thermostat performance is a key step in maintaining efficiency.

When to Call the Experts

If you’re experiencing any of these furnace failure warning signs, it’s time to contact a trusted HVAC professional. At Goff Heating and Air Conditioning, we’ve been providing reliable solutions to South Bend, Mishawaka, Granger, and Elkhart families since 1937. Whether it’s a quick repair, system replacement, or routine maintenance through our GoffCare Membership, we’re here to help.

Tips to Prevent Furnace Problems

  • Replace air filters regularly (every 1-3 months).
  • Keep the area around your furnace free of debris.
  • Seal gaps in ductwork to improve efficiency.
  • Schedule annual inspections with a certified technician.

Protect Your Home and Comfort

Don’t wait for your furnace to break down during a cold snap. Recognizing furnace failure warning signs early can prevent expensive repairs and ensure your home stays warm all winter. Contact Goff Heating and Air Conditioning today for a consultation or to schedule service.

Quality You Trust. Service You Deserve. Since 1937.