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How To Fix Heater Problems: Six Common Furnace Issues

A well-functioning heating system is essential for maintaining a comfortable temperature in your home during the colder months. However, furnace problems can arise, leaving you with a cold and uncomfortable living space.

In this blog post, we will discuss six common furnace issues and provide tips on how to troubleshoot and fix them.

Thermostat Issues

The thermostat is the control center of your heating system, and issues with it can lead to furnace problems. Some common thermostat-related issues include:
  • Incorrect temperature settings
  • Dead batteries
  • Faulty wiring

To troubleshoot thermostat problems:
  • Ensure that the thermostat is set to "heat" and the desired temperature is higher than the current room temperature.
  • Replace the batteries if necessary.
  • Check for any loose or damaged wiring and consult Metro Plumbing, Heating & Air Conditioning if you find any issues.

Dirty Or Clogged Air Filters

A dirty or clogged air filter can reduce your furnace's efficiency, cause it to overheat, or lead to poor indoor air quality. To resolve this issue:

Inspect your air filter at least once a month and replace it as needed. Most air filters need to be replaced every 30-90 days, depending on their type and usage.

Consider upgrading to a high-efficiency air filter for better filtration and longer lifespan.

Ignition Problems

Modern furnaces typically use electronic ignitions or pilot lights to ignite the burners. Issues with the ignition system can prevent your furnace from producing heat.

Some common ignition problems include:
  • Faulty ignitors
  • Pilot light problems

To troubleshoot ignition issues:
  • Check the electronic ignition for any visible damage or dirt buildup. If necessary, gently clean the ignitor with a soft brush or replace it if damaged.
  • For pilot light issues, ensure that the gas supply is on and relight the pilot light following the manufacturer's instructions. If the pilot light won't stay lit or continues to go out, consult a professional technician.

Blower Motor Issues

The blower motor circulates warm air throughout your home. Problems with the blower motor can result in inadequate heating or noisy operation.

Some common blower motor issues include:
  • Overheating
  • Worn-out belts
  • Faulty capacitors

To troubleshoot blower motor issues:
  • Inspect the blower motor for any signs of overheating or damage. If the motor is overheating, ensure that the air filter is clean and the vents are not blocked.
  • Check the belts for wear and tear and replace them if necessary.
  • If the motor is not running, the capacitor may be faulty. Consult a professional technician for capacitor replacement.

Ductwork Issues

Leaky or poorly insulated ductwork can cause heat loss and reduce the efficiency of your heating system. Some common ductwork issues include:
  • Gaps or leaks in duct joints
  • Poor insulation

To troubleshoot ductwork issues:
  • Inspect your ducts for any visible gaps, leaks, or damaged insulation. Seal any gaps or leaks with duct tape or mastic, and replace or add insulation as needed.
  • If you're unsure about the condition of your ductwork or need assistance, consult a professional technician.

Insufficient Gas Supply

A furnace requires an adequate gas supply to operate efficiently. If your furnace is not producing enough heat, there may be an issue with the gas supply.

To troubleshoot gas supply issues:
  • Ensure that the gas valve is fully open and the gas supply is not interrupted.
  • Check for any visible damage or blockages in the gas line and consult a professional technician if you suspect a gas leak or other issues with the gas supply.


Furnace problems can be both inconvenient and uncomfortable, especially during cold weather. By understanding and addressing these six common furnace issues, you can keep your heating system running efficiently and maintain a comfortable temperature in your home. Always remember to prioritize safety when troubleshooting your furnace, and don't hesitate to consult a professional heating technician if you're unsure about a problem or if the issue persists.

Regular maintenance, such as changing air filters and inspecting your furnace's components, can help prevent many common furnace problems and extend the lifespan of your heating system.