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5 Common Furnace Problems to Look Out For


It’s chilling to know that the coldest temperature in Oregon was -54 degrees.

Even though most people don’t have to face those extreme temperatures, winters can still be uncomfortable. We all deserve a powerful furnace.

What are some of the most common furnace problems that could sabotage your winter? Read on so you can stay warm and cozy.

1. Dirty Filters

Dirty filters can wreak havoc on your furnace’s performance. Over time, filters accumulate dust, debris, and allergens, hindering the flow of air.

This reduced airflow causes the furnace to work overtime. These are the symptoms:

  • Uneven heating throughout the house
  • Increased energy bills
  • Frequent cycling of the furnace

Check and replace furnace filters often, especially during peak usage months. This simple maintenance task not only ensures better indoor air quality but also helps your furnace operate at its optimal level.

2. Clogged Filters

Closely related to dirty filters, clogged filters pose a more severe threat to your furnace’s functionality. When filters become extremely congested, airflow is significantly restricted.

This forces the furnace to overheat, which can damage crucial components. Here are the symptoms:

  • Inadequate heating
  • Unusual noises, such as banging or whistling
  • Frequent system shutdowns

Swap out clogged filters right away to ensure a free flow of air. Cleaning or replacing filters several times a year can prevent this problem altogether and boost the lifespan of your furnace.

3. Bad Limit Switch

The limit switch regulates the furnace’s operation to prevent it from overheating. If the limit switch malfunctions, it can lead to various issues, including constant cycling, inadequate heating, or a complete system shutdown. Here are the symptoms:

  • Short-cycling (frequent on/off cycles)
  • Inconsistent temperature control
  • Complete system failure

A faulty limit switch should be replaced by a qualified technician. Regular professional inspections can identify potential problems with the limit switch before they escalate to ensure the safety and efficiency of your furnace.

4. Pilot Light Issues

The pilot light is a small flame that ignites the gas in your furnace so it can produce heat. If the pilot light goes out or exhibits irregularities, it can disrupt the heating process and leave you in the cold. Here are the symptoms:

  • No heat production
  • A continuously flickering or unstable pilot light
  • A strong smell of gas

Relight the pilot light following the manufacturer’s instructions if it goes out. If the issue persists, or if you notice a gas odor, turn off the furnace right away and seek professional assistance. Prioritizing safety and avoiding furnace repairs beyond your expertise is crucial.

5. Cracked Heat Exchanger

The heat exchanger brings heat from the furnace to the air. Over time, it can develop cracks that allow harmful gases to enter your home. Here are the symptoms:

  • Elevated levels of carbon monoxide
  • Soot accumulation around the furnace
  • Inconsistent heating

This is a serious issue that demands professional attention. Regular furnace inspections by qualified technicians can detect potential cracks to ensure the safety of your household.

Homeowners Need to Know These Common Furnace Problems

Being vigilant about these common furnace problems can save you from discomfort and potential hazards. Regular maintenance, prompt filter replacements, and professional inspections will keep your furnace running smoothly.

Are you in need of furnace services in Oregon or Washington? Contact Ultimate Comfort to book your visit. We have over three decades of experience.

Interested In Learning More?

Get in touch with us today to learn about all the services we can provide for you!

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