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Common Furnace Problems and How Furnace Repair Services Can Help

A properly operating furnace is very important in the cold months so that people living in a certain house remain warm. Nevertheless, like any other complex system, furnaces can be subject to problems that affect their functioning.

Learning about frequent furnace issues and when you should engage a professional repair service will help you save time as well as money, besides sparing you the unpleasant experience of being stuck in a cold house.

This article looks at general troubles within a furnace and discusses how professional furnace repair services can help fix them.

1. Furnace Not Producing Heat

One of the most alarming problems homeowners encounter is a furnace that doesn’t produce heat.

● Causes:
○ Thermostat Issues: This may be a result of a problem with the thermostat setting or it may be faulty.
○ Pilot Light or Ignition Problems: The pilot light might be out or the ignition system might not be functioning as it should.
○ Gas Supply Issues: Perhaps the gas valve next to the furnace is shut or the line has an issue with supplying gas to the furnace.
● Solutions:
○ Thermostat Check: Ensure that the required temperature setting is higher than the current indoor temperature and the thermostat is in the ‘heating’ mode. If it meets the criteria of a programmable thermostat then first look at what settings are currently programmed.
○ Pilot Light or Ignition: Check pilot light or the ignition system if it is out then relight it. If in doubt, consult a specialist.
○ Gas Supply: Ensure that the gas valve is opened early enough. If you indeed have a gas line problem, report it to your supplier or a furnace repair as soon as possible.

2. Inadequate Heating

● Causes:
○ Clogged Filters: Clogged up air filters limit the amount of air that the furnace can draw and therefore the efficiency of the furnace is limited.
○ Ductwork Issues: Unsatisfactory insulation or wear and tear on the ducts may result in heat loss.
○ Blower Problems: A malfunctioning blower could be one that does not distribute the air effectively.
● Solutions:
○ Filter Replacement: Replace or clean the air filters regularly to ensure proper airflow.
○ Duct Inspection: Inspect the ductwork for leaks or poor insulation and repair as needed.
○ Blower Maintenance: Check the blower motor and fan for any issues. A professional can lubricate or replace parts if necessary.

3. Frequent Cycling

If your furnace turns on and off frequently, it’s known as short cycling. This can cause wear and tear on the system and increase energy costs.

● Causes:

○ Thermostat Problems: The thermostat may be improperly placed or malfunctioning.
○ Overheating: The furnace might be overheating due to restricted airflow or mechanical issues.
○ Improper Sizing: An oversized furnace can heat the space too quickly, causing it to cycle frequently.

● Solutions:
○ Thermostat Adjustment: Ensure the thermostat is away from heat sources and check for proper operation.
○ Address Overheating: Clean or replace filters and check for any airflow obstructions. Have a professional inspect the furnace for mechanical issues.
○ Proper Sizing: If your furnace is improperly sized, consult with a heating professional to explore replacement options.

4. Noisy Furnace

Unusual noises from the furnace can indicate various issues.
● Causes:
○ Loose Components: Parts like screws, panels, or belts may be loose.
○ Ductwork Expansion: Metal ducts expanding and contracting can cause banging or popping sounds.
○ Mechanical Issues: Worn or failing components like bearings, motors, or blowers can create noise.
● Solutions:
○ Tighten Loose Parts: Inspect and tighten any loose components.
○ Duct Insulation: Insulate ducts to minimize noise from expansion and contraction.
○ Professional Inspection: Have a professional inspect and replace any failing components.

5. Furnace Blowing Cold Air

Understanding the installation process can help you prepare and ensure everything goes smoothly.

A furnace that blows cold air instead of warm can be frustrating and uncomfortable.
● Causes:
○ Thermostat Settings: The thermostat fan setting might be set to “on” instead of “auto”.
○ Pilot Light Out: The pilot light might be extinguished.
○ Dirty Flame Sensor: A dirty flame sensor can cause the burner to shut off prematurely.
● Solutions:
○ Adjust Thermostat: Set the thermostat fan setting to “auto” to ensure it only blows warm air.
○ Relight Pilot Light: Follow the furnace manual instructions to relight the pilot light.
○ Clean Flame Sensor: Carefully clean the flame sensor with a fine abrasive pad. If unsure, contact a professional.

6. Furnace Not Turning On

When a furnace fails to start, it can be due to several issues.

● Causes:
○ Power Issues: There might be a tripped breaker or a blown fuse.
○ Thermostat Problems: The thermostat might be dead or have dead batteries.
○ Internal Components: Issues with internal components like the blower motor or control board can prevent startup.
● Solutions:
○ Check Power Supply: Reset any tripped breakers or replace blown fuses.
○ Thermostat Maintenance: Replace thermostat batteries or replace the thermostat if faulty.
○ Professional Repair: Contact a professional to diagnose and repair any internal component issues.

7. Pilot Light or Electronic Ignition Problems

  • If the pilot light or electronic ignition fails, the furnace won’t heat.
    ● Causes:
    ○ Dirty Pilot Light: Dirt and debris can block the pilot light.
    ○ Faulty Ignition: The ignition system may have a defect or damage.
    ● Solutions:
    ○ Clean Pilot Light: Clean the pilot light assembly carefully.
    ○ Ignition Repair: Have a professional inspect and repair or replace the ignition system.

8. Thermostat Malfunctions

The thermostat is the brain of your heating system, and any malfunction can disrupt furnace operation.
● Causes:
○ Wiring Issues: Faulty or disconnected wires can lead to thermostat failure.
○ Outdated Model: Older thermostats might not function as efficiently as newer models.
○ Improper Installation: Incorrect installation can cause inaccurate readings and poor performance.
● Solutions:
○ Inspect Wiring: Check for any wiring issues and fix them.
○ Upgrade Thermostat: Consider upgrading to a programmable or smart thermostat.
○ Professional Installation: Ensure professional installation for optimal performance.


Maintaining a functional furnace is crucial for comfort and energy efficiency during colder months. Understanding common furnace problems and knowing when to call in professional furnace repair services can help you avoid unnecessary discomfort and expenses. Contact Finest Heating & Air for reliable and efficient service for expert furnace repair and maintenance.

Frequently Asked Questions

1. When should I take my furnace for servicing?

An annual or pre-season tune-up is advised for your furnace to ensure it’s in good working condition before you need it most.

2. What causes a high-pitched sound to come from my furnace?

Loud, high-pitched sounds always indicate that it is time for a repair due to, for instance, a slipping blower belt or motor bearings which require lubrication. Professional inspection is advised.

3. Can I repair my furnace on my own?

As much as it may save you some bucks to do things like changing filters by yourself, it is advisable to let the professionals handle the more complicated repairs to avoid mishaps and have the dishwasher function as it is supposed to.

4. What can be done in the event that the furnace fails during the night?

Take a peek at basic problems like possibly a thermostat setting was changed or a breaker was blown. If the problem is not resolved, then the repair service should be sought from a number of emergency furnace repair services.

5. What could I do to get more efficiency from the furnace?

Another aspect of proper heating system care is change or cleaning the filter, checking the ducts for leaks, and insulation as these will facilitate proper working of the furnace.

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