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Furnace Troubleshooting Guide: 5 Common Problems and Solutions

December 27, 2024

As the temperatures drop in Minnesota, your home heating system becomes a vital part of keeping your home warm and comfortable. However, like any mechanical system, your furnace can occasionally experience trouble. Continue reading to learn how to identify common problems and prevent major issues with our furnace troubleshooting guide.

1. No Heat/Not Running

  • Check the Thermostat: Ensure the thermostat is on the "Heat" setting and the temperature is set higher than the current room temperature.
  • Check the Circuit Breaker: Make sure the circuit breaker for your furnace hasn't tripped in your electrical panel.
  • Check the Switch: Make sure that the switch (looks like a light switch) by the furnace is in the ON position.
  • Inspect the Air Filter: A dirty air filter restricts airflow, preventing your furnace from operating efficiently. Replace or clean the filter per the manufacturer's guidelines.
  • Check the Pilot Light (if applicable): If your furnace has a pilot light, ensure it's lit and burning steadily.

2. Furnace Runs but Doesn’t Produce Heat

  • Check for Blocked Vents: Ensure all vents and registers are open and unobstructed.
  • Inspect the Blower: If you hear the blower running but no heat is being produced, the blower motor or belt may need attention. To ensure safe and effective repair, contact a professional.


3. Furnace Makes Strange Noises

  • Banging or Clanging: This could indicate loose parts within the furnace.
  • Screeching or Grinding: These sounds may indicate a problem with the blower motor or fan bearings.
  • Rattling: This could be caused by loose components within the furnace.


4. Furnace Cycles On and Off Frequently

“Short cycling” occurs when the furnace turns on and off rapidly, preventing it from reaching the desired temperature. This can be caused by a dirty air filter, a faulty thermostat, or a problem with the gas supply.

5. Unusual Odors

  • Burning Smell: This could indicate an electrical problem or a malfunctioning burner or motor. It can also be due to dust and debris being heated within your ductwork, which may mean it’s time for professional duct cleaning.
  • Gas Smell: If you smell gas, immediately turn off the furnace and contact a qualified HVAC professional.


Rely on the Professionals at WestAIR

Please note that this furnace troubleshooting guide provides general information and is not a substitute for professional advice. If you're unable to resolve the issue yourself or suspect a serious problem, it's crucial to contact a certified HVAC technician.


WestAIR Heating & Cooling proudly offers professional furnace repair and maintenance services throughout the 13-county Twin Cities metro area. Contact us today to schedule service and learn more.

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