Why my Furnace is not heating the house?

Why My Furnace is Not Heating the House

Suppose you come back home on a cold day and expect a cozy atmosphere, but instead, you experience cold and uncomfortable indoors. You look at the thermostat, turn it on, and wait no heat yet. If you have ever experienced this, you are not alone. It is quite frustrating to face such an issue during the cold season.

A furnace is an integral part of homes in Canada, as it helps keep the home comfortable and warm. What if it’s not working as usual, everything seems a little harder. Whether it’s no heat, poor airflow, or cold air coming from the vents, a malfunctioning furnace can completely change the ambiance of your home by making it cold. Don’t worry! We have a good news for you.

Many furnace problems are simple and can be handled by anyone. Possibly, it’s as simple as adjusting the thermostat, inspecting whether the power switch is on, or replacing a dirty air filter. But that doesn’t mean all problems can be solved at home as they may be more complex technical issues. If there is something serious like a clogged vent, broken pilot light, or a component that is not working, you can seek professional help.

You can rely on the heating system professionals at Smile HVAC. No matter what model or build your furnace has, we are available 24*7 to resolve your plumbing, cooling, and heating issues day or night.  Now, let’s delve into some common causes why your furnace isn’t heating your house properly. At the end of this information, you will get a better idea of what’s going on and how to get comfort and warm back again.

       1. Thermostat Issues

An incorrect thermostat setting can cause your furnace to seem like it’s working, but there’s no heat coming out of your vents. If there’s no warm air coming out of your furnace, you’ll need to make sure your thermostat is set to heating instead of cooling. It’s a common mistake that occurs usually than you might think. If the fan setting on your thermostat is set to “On”, the fan will work non-stop, even when the furnace isn’t warming. This can make it look like the furnace is on, but in actuality, it’s just the blower running. With no active heating cycle, no hot air will be circulated within your home.

Dead batteries can also impact the functionality, and if so, replace them as soon as possible. Another possible cause related to the thermostat issue is calibration. If your thermostat is improperly calibrated, it might convey incorrect signs to the furnace, leading to damage or failure to keep your home warm. To address this issue, you can reach out to Smile HVAC for professional assistance.

Solution:

• Make sure the fan is set to “Auto,” which enables the blower motor to operate only during the heating cycle. Setting this to “On” will cause the blower to blow cool air instead of warm air as described above when the furnace is not on and consume more power.
• If the furnace does not turn on, make sure the thermostat is set a few degrees more than the present room temperature. By doing so, you will see the heating cycle begin and the furnace will turn on and continue burning.
  

  2. Dirty Air Filters

Dirty or clogged air filters are one of the most common reasons furnaces fail to heat a home properly. Air filters trap dust, debris, and other particles while keeping the airflow clean. Well, over time, they can become clogged, restricting airflow and causing the furnace to overheat and shut down. Any time you notice a problem with your furnace’s heating performance, don’t forget to check the air filter. The more clogged the filter is, the less airflow into the furnace, and ultimately, the less heated air there is to send into the home. Some areas of the house will get enough warm air, and others will not. If your filter has been in position for more than 2 months, it definitely needs to be replaced.

Solution:

• Check your air filter every 1-3 months, particularly during the chilly season when your furnace is running frequently.
• If the filter appears dirty or clogged, replace it. Choose premium quality filters, which are suitable for Canadian winters.
  

  3. Blocked or Leaky Air Ducts

Ductwork plays a vital role in distributing hot air. If the ducts are blocked or leaking, warm air won’t be able to reach every nook and corner of your home. You may also want to take a quick walk through your home to make sure there aren’t any ducts being prevented by carpet or furniture.

Additionally, there may be blockages inside your ducts, especially if they haven’t been cleaned in a long time. Leakage in ducts is also another cause of uneven heating. In case of signs like blocked or leaking ducts, visible gaps or damage in the ducts, uneven heating in corners, increase in electricity bills, get the thermal analysis done from an experienced expert like Smile HVAC, instead follow the below solutions at home. If you notice any issues like visible gaps or damage in ducts, uneven heating in corners, increase in electricity bills, get the thermal analysis done from an experienced expert like Smile HVAC, or follow the below solutions at home.

Solution:

• Check your ducts for visible blockages or damage.
• Seal any leaks using aluminum tape or a specialized sealant.
• Opt for professional duct cleaning to eliminate debris and improve airflow.
  

  4. Pilot Light or Ignition Problems

Old units rely on a pilot light, while the latest models use electronic ignition systems. If either of these components fails, the furnace may not create any heat. The furnace will show “turn on” but in reality, no heat coming out.  Note: if you’re using electronic systems, reach out to Smile HVAC for professional inspection and repair.

Solution:

• Inspect the gas valve on the gas supply line and ensure the gas valve is open.

• For liquid propane, check your propane or oil tank, as it may need a refill.

• If you’re using natural gas, contact your utility provider to ensure is there any interruptions in service.

• If your unit has a pilot light, ensure if it’s out and relight it following the manual instructions. In electronic ignition systems, a dirty ignitor switch could be the culprit. So, clean it gently, but be cautious, as it’s extremely delicate.
  

  5. Faulty Blower Motor

The blower motor is responsible for circulating hot air within the ductwork. If it goes bad, your furnace will struggle to distribute heat. This could be a problem with a failed blower fan motor, in such a case the motor will need to be replaced. If the blower motor is indeed the culprit, it may send you signs such as weak or zero airflow from the vents, strange noises such as rattling or squeaking, frequent cycling of the furnace, etc.

Solution:

• Check the blower motor for noticeable damage or dirt accumulation.
• Lubricate the motor bearings if required.
• Call a professional like Smile HVAC to repair or replace the damaged blower motor.
  

  6. Aging Furnace

Like any other appliance, furnaces have a finite lifespan. If you notice improper comfort offered by your furnace or other signs such as increased electricity bills, frequent malfunctions, or uneven heating, then it is definitely a warning sign that the unit is approaching the last stage of its service.

As soon as the heating power fails, you will notice that your home is not receiving the required heating levels, along with the ventilation network. If your furnace exceeds its 15-year life limit, call our HVAC experts at Smile HVAC to inspect it. Our experts give you real feedback on whether you should repair or replace your furnace.

Solution:

• Consider purchasing a newer, energy-efficient model. Many Canadian provinces offer rebates or incentives for energy-efficient furnace replacements.
  

  7. Thermal Insulation Issues

Sometimes, the problem may not lie with the furnace itself but with poor insulation in your home. Insufficient insulation can cause heat to escape, making it difficult for the furnace to maintain a comfortable temperature. In that case, you’ll need HVAC experts to make the required furnace repair to the insulation problems.

Solution:

• Inspect your home’s insulation, particularly in the attic and walls.
• Seal any gaps or cracks around windows and doors to prevent drafts.
• Switch to energy-efficient windows if necessary.
  

  8. Frozen Condensate Line

In Canada’s chilly temperatures, the condensate line in high-efficiency furnaces can freeze, causing the furnace to shut down. When this happens, it can restrict the smooth drainage of water for safety purposes. If you notice that your furnace isn’t working and the weather is extremely cold, this could be the problem. You may need to have the condensate line thawed or inspected to prevent future problems.

Solution:

• Inspect the condensate line for ice or blockages.
• Utilize warm water or a heat source to thaw the line.
• Insulate the line to avoid future freezing.
  

  9. Short Cycling Issue

This occurs when your furnace operates for only a short period before turning off, causing it to restart continuously. As a result, it strains the furnace, doubles the energy bills, and prevents even heat distribution. Short-cycling can have several causes such as a damaged thermostat, clogged air filter, overheating, faulty limit switch, or a problem with the furnace’s heat exchanger. Short cycling itself is a sign of another problem, but don’t worry, our experts can help find and fix the problem.

 

        10. Tripped Circuit Breaker 

If the furnace is on, meaning its switch is on, but the furnace is still not producing heat, the circuit breaker supplying power to it may be tripped. Inspect the breaker box to make sure the HVAC breaker is on. The breaker box is usually appropriately labeled. If not, the furnace breaker might be flipped to the opposite side from the others.

Are you still having trouble identifying the furnace breaker? Look no further because our HVAC professionals suggest flipping each breaker on till you notice the furnace turn off, signaling you’ve found the furnace breaker. To reset it, turn the breaker off and then back on. Next, for future reference, label the furnace breaker.

Call a Professional at Smile HVAC today!

If you’ve tried all the steps mentioned above and haven’t had any success, it’s time to contact our professionals. Our HVAC experts have the expertise and equipment needed to inspect your furnace and ensure no parts are malfunctioning or deteriorating, including the electric box, gas valves, burners, and more.

If you’re an Ontario-based homeowner, contact us today to book a heating repair service with one of Smile HVAC’s trusted technicians. We assure to extend the life of your furnace system and prevent future breakdown of components.

Conclusion

A furnace that’s not heating your home could be caused by a variety of problems, from simple solutions like changing the air filter to more complex issues like faulty components or an inadequate gas supply. By following the steps outlined in this guide, Canadian homeowners can troubleshoot common furnace problems and ensure their homes stay warm and comfortable all winter long.