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Common Furnace Repair Problems

OKC Heater Services

When winter temperatures drop in Oklahoma City, your furnace becomes one of the most important systems in your home. But what happens when it stops working properly?

At Hill & Co., we know that understanding common furnace issues can help you catch small problems before they turn into costly repairs. In this guide, we’ll walk you through some of the most frequent furnace repair problems, their symptoms and what you can do to keep your home warm and comfortable all season long.

1. Furnace Won’t Turn On

Symptoms: No heat, no fan noise, no response when adjusting the thermostat

Possible Causes:

  • Thermostat settings are incorrect or the batteries are dead
  • Tripped circuit breaker or blown fuse
  • Ignition system failure (for gas furnaces)

Solution: First, check the thermostat settings and replace the batteries if needed. Next, ensure the breaker hasn’t tripped. If these don’t resolve the issue, the ignition system may need professional repair.

2. Weak Or No Airflow

Symptoms: Furnace runs, but airflow is weak or nonexistent

Possible Causes:

  • Clogged air filter restricting airflow
  • Blower motor failure
  • Issues with the ductwork, such as leaks or blockages

Solution: Change your furnace filter regularly to prevent clogs. If airflow remains weak, it may be due to a faulty blower motor or leaky ducts, which require professional inspection and repair.

3. Furnace Blowing Cold Air

Symptoms: Furnace runs but only blows cool or lukewarm air

Possible Causes:

  • Dirty flame sensor preventing ignition
  • Pilot light or ignition failure
  • Overheated furnace causing the safety switch to shut off the burners

Solution: If you have a gas furnace, check that the pilot light is on. If the flame sensor is dirty, it may need cleaning or replacement. An overheating furnace often results from a dirty filter or airflow issues — try replacing the filter before calling a professional.

4. Frequent Cycling (Turning On And Off Repeatedly)

Symptoms: Furnace starts and stops frequently, struggling to maintain the desired temperature

Possible Causes:

  • Dirty or clogged filter causing overheating
  • Thermostat malfunction or improper placement (e.g., near a heat source)
  • Improperly sized furnace

Solution: Change the air filter and check the thermostat settings. If the issue persists, it may be due to an incorrectly sized furnace, which requires a professional assessment.

5. Strange Noises Coming From The Furnace

Symptoms: Banging, rattling, squealing or whistling noises

Possible Causes:

  • Loose or broken components inside the furnace
  • Blower motor issues
  • Ignition delay causing a loud “bang”

Solution: If you hear banging or rattling, turn off the furnace and check for loose panels. High-pitched squealing often indicates a worn-out blower belt, while persistent loud noises may signal a failing blower motor or burner issue. These problems require prompt professional attention.

6. Unusual Smells From The Furnace

Symptoms: Burning, musty or gas-like odors when the furnace runs

Possible Causes:

  • Dust burning off at the start of the season (temporary issue)
  • Clogged filter causing overheating
  • Gas leak (serious concern!)

Solution: If you smell gas, turn off your furnace immediately, leave your home and call your gas company. A burning smell often indicates dust buildup or a clogged filter, which can be resolved by replacing the filter.

7. Rising Energy Bills

Symptoms: Sudden or unexplained increase in heating costs

Possible Causes:

  • Dirty filters forcing the furnace to work harder
  • Aging or inefficient furnace
  • Leaky ducts losing heated air

Solution: Routine maintenance, including filter changes and duct inspections, can help improve efficiency. If your furnace is more than 15 years old, upgrading to a more efficient model could save you money in the long run.

Get Reliable Furnace Repair And Service In OKC

At Hill & Co., we understand how frustrating furnace problems can be — especially during the coldest months in Oklahoma City. Whether you’re dealing with weak airflow, strange noises or a complete breakdown, our team of experts is here to help. Regular maintenance and timely repairs can keep your furnace running efficiently, ensuring you stay warm all winter long.

If you’re experiencing any of these common furnace issues, don’t wait until the problem gets worse. Contact Hill & Co. today for expert furnace repair and service in OKC!

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