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Common Furnace Problems & Troubleshooting Tips

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Your furnace plays a crucial role in keeping your home warm and comfortable during the chilly months of the year. However, like any mechanical system, it can experience issues from time to time. The good news is that understanding common furnace issues and how to troubleshoot them can be your ticket to a hassle-free and budget-friendly winter. In this guide, we’ll dive into the world of your home’s heating system, shedding light on those everyday furnace problems many homeowners face. Our mission is simple: to provide you with clear, user-friendly troubleshooting tips that empower you to take control of your heating needs. It’s time to say goodbye to winter worries as we equip you with the knowledge to tackle furnace issues like a pro, and contact professional furnace repair experts in Calgary when necessary. 

Lack of Heat

Problem: Your furnace is running, but it’s not producing enough heat or any heat at all.

Troubleshooting Tips:

  • Check the thermostat settings: Make sure your thermostat is set to “heat” and the temperature is set higher than the current room temperature.
  • Replace or recharge the thermostat batteries: Weak or dead batteries can cause thermostat malfunctions.
  • Inspect the air filter: A clogged or dirty air filter can restrict airflow, leading to insufficient heating. Replace or clean the filter as needed.

Strange Noises

Problem: Your furnace is making unusual noises, such as banging, rattling, or squeaking.

Troubleshooting Tips:

  • Check for loose components: Inspect the furnace for loose screws, bolts, or panels that may be causing vibrations or rattling. Tighten or secure them as necessary.
  • Clean the blower motor: Dust and debris can accumulate on the blower motor, causing squeaking sounds. Gently clean it to eliminate the noise.
  • Lubricate moving parts: Apply lubricant to the furnace’s moving parts, such as the blower motor and bearings, to reduce friction-related noise.

Continuous Cycling On and Off

Problem: Your furnace turns on and off frequently without maintaining a consistent temperature.

Troubleshooting Tips:

  • Check the thermostat location: Ensure it is not exposed to drafts or direct sunlight, as this can cause it to register incorrect temperatures and lead to frequent cycling.
  • Replace or recalibrate the thermostat: If you suspect a thermostat issue, consider replacing it with a programmable thermostat or recalibrating the existing one.
  • Inspect the air filter: A dirty or clogged filter can cause the furnace to overheat and shut off prematurely. Clean or replace the filter to improve airflow.

Pilot Light Problems (For Older Furnaces)

Problem: If you have an older furnace with a pilot light, it may go out frequently or burn with a yellow or flickering flame.

Troubleshooting Tips:

  • Relight the pilot light: Follow the manufacturer’s instructions to relight the pilot light. If it keeps going out, it may indicate a more significant issue requiring professional attention.
  • Clean the pilot assembly: Dust and dirt can accumulate on the pilot assembly, affecting its performance. Gently clean it with a soft brush or compressed air.
  • Adjust the pilot flame: If the pilot flame appears yellow or uneven, adjust the flame using the pilot adjustment screw on the gas valve. It should burn with a steady blue flame.

Noisy Ductwork

Hands Changing Furnace Air Filter

Problem: You hear banging or popping noises coming from your ductwork when the furnace starts or stops.

Troubleshooting Tips:

  • Inspect and secure duct connections: Loose or disconnected ducts can create noise when the furnace operates. Check for loose connections and secure them with duct tape or metal fasteners.
  • Add insulation: Wrapping your ducts with insulation can reduce noise transmission and improve energy efficiency.
  • Consider professional ductwork inspection: If the noise persists, it may be a sign of ductwork issues that require a professional assessment.


While these troubleshooting tips can help you address common furnace problems, it’s important to remember that safety should always come first. If you encounter a problem you’re uncomfortable handling or if your furnace issues persist after troubleshooting, it’s best to seek professional furnace repair services in Calgary. Remember, regular maintenance can prevent many of these common problems from occurring in the first place. Additionally, a well-maintained furnace operates more efficiently, saving you money on energy bills and prolonging the lifespan of your heating system.

By staying proactive and knowledgeable about your furnace, you can ensure that your home remains warm and comfortable throughout the winter season, and you can possess the knowledge to address common issues promptly, minimizing disruptions to your daily life.

Since 1988, Horizon Heating Ltd. has been providing affordable indoor air quality services and AC installation to Calgary and surrounding area. With care and precision, we ensure that our products and services are reasonably priced and widely available. Our AC & Calgary furnace repair service is conducted by professional maintenance technicians, all qualified to provide AC installation, air conditioning repair, and furnace duct cleaning; this includes all models of duct, furnace, and air conditioning. By partnering with contractors and home builders, we expertly install new home HVAC systems, and work together with clients to create custom renovation solutions for all residential projects. Call us today at 403-274-0790.