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Air Conditioning Repair | The Top 5 Causes of Furnace Problems and How to Fix Them

Jan 16

Furnaces are an essential part of any home’s heating system, but they can also be a source of frustration when they malfunction. The top five causes of furnace problems include dirty filters, thermostat issues, pilot light problems, a malfunctioning blower motor, and a broken ignitor. Each of these issues can be resolved with a little bit of knowledge and the right tools. In this article, we will discuss the most common furnace problems and provide tips on how to fix them.


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Dirty or clogged air filter

Your furnace must be able to draw air from the outside to heat it and generate heat. The air filter is one part of your heating system that helps do this. Air filters are designed to trap particulates and other pollutants so they can’t reach your furnace’s heating element or blower motor, which would prevent them from doing their job. Over time, dirty air filters can become clogged with these small particles and debris, affecting how efficient the furnace is at heating the house. This decrease in airflow will cause your furnace to work harder than it needs to heat the home, which can result in furnace problems.

If your furnace is having problems heating the house, the air filter is likely dirty. You can clean your air filter using a vacuum cleaner with a dust pan attachment or by taking it to a repair service company. If you decide to replace the air filter yourself, be sure to follow all of the manufacturer’s instructions.

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Thermostat issues

Explanation of how thermostat problems can cause furnace problems. A furnace thermostat is a heating and cooling system that controls the furnace’s operating temperature. Normal wear and tear on these thermostats can cause them to stick or fail to rotate sufficiently, which in turn can lead to uneven heating or cooling. Additionally, if there is a blockage in the furnace ducts or air handler, this can also affect heat distribution and airflow within the HVAC system. As such, it is important to have your furnace serviced as soon as possible if you notice any trouble with your thermostat.

If the furnace is not heating or cooling properly, it may be necessary to adjust the thermostat settings. You will need to remove the furnace cover and locate the thermostat inside the cabinet. Once you have found it, turn it to its lowest setting and wait five minutes before testing your furnace by turning on a light switch in an adjacent room. If your furnace starts up correctly, you may need to adjust one of its four temperature settings. If your furnace does not start up at all after adjusting your thermostat, then it may be time to replace the thermostat.

Pilot or ignition control problems

Internal furnace problems can cause several issues with the pilot or ignition control. If one of these components goes out, it can prevent the furnace from heating up properly, causing damage to the system and possible repair costs. In some cases, an air conditioning service technician may be able to fix the issue by replacing parts on your furnace. Pilot or ignition control issues can be caused by various things, including dirty air filters, broken thermostat wires, and carbon monoxide poisoning. If the pilot or ignition control becomes damaged in any way, it may not work properly and could cause your furnace to malfunction. In some cases, an air conditioning service technician may be able to repair the issue by replacing parts on your furnace.

If your furnace is not heating up, it may be because of a dirty air filter. To clean the filter, open the hood and remove the air filter. Wash it in warm water with soap and allow it to dry before 

 replacing it. Broken thermostat wires can also cause problems with furnace heating, so if you notice any signs of broken wiring or heat flickering, have an air conditioning service technician repair the wire as soon as possible. Carbon monoxide poisoning can also prevent your furnace from heating up properly; if you suspect this might be the case, call an air conditioning service technician to check the system.


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Blocked flue or vent

If your furnace is not heating or cooling properly, there may be a problem with the furnace’s flue system. The most common cause of a blocked flue or vent is an accumulation of soot and ash in the system. This can block airflow and lead to overheating and possible carbon monoxide poisoning. If you think your furnace may have a blocked flue or vent, please call our service department for assistance.

  1. Turn off the main power to your furnace.
  2. Open the furnace’s air vents and let the heat out!
  3. Use a hanger or some other tool to clear any obstruction from the flue or vent opening(s).
  4. If there is soot and ash present, use a vacuum cleaner with a hose attachment to remove it;   avoid using water because it will quickly wet down the soot and ash, making it harder to remove later on.
  5. Once all the soot and ash have been vacuumed or swept away, replace any air filters that may have become dirty and reinstall your air vents.

Broken or worn parts

Explanation of how broken or worn parts can cause furnace problems. A furnace’s blower motor is designed to circulate air through the stove and heat it. The blower motor can become overloaded if it lacks airflow, which can wear out its bearings or fan blades over time. When this happens, the engine will start making loud noises and fail. In addition, a worn or broken duct system (which moves air from the air conditioner into the furnace) can lead to improper heating of your home.

If you notice that one or more of your furnace’s parts are broken or worn, it’s important to take action immediately. This includes replacing any parts that have failed, as well as those that are starting to show signs of wear. By doing this, you can ensure that your furnace is running smoothly and heating your home properly.


Summary of the top causes of furnace problems and steps to fix them. furnace repair cost heating service prices The leading causes of furnace problems include: air leaks, clogged vents or cooling systems, power surges, and lack of air conditioning.  To fix these issues, homeowners can replace air filters, clean ducts and vents using a vacuum cleaner and blower tool with a dustbin attachment, or use an electric heat mat to clear away debris buildup in the heating system. In some cases, it may be necessary to service the furnace. Prices for furnace repair vary depending on the severity of the issue.

At Cirtech CVAC Inc., we offer heating and cooling services for all of Toronto. We can help you troubleshoot any furnace problems and recommend the best action to fix them – whether a simple repair or a full-service call-out.


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