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homeowner with a furnace not turning on

If you own a home in Hamilton, you know how freezing the winter could get. When the indoor temperature drops, we all need adequate heating to survive. But then you suddenly notice your heating system is not working. So you ask yourself, “Why won’t my furnace turn on?” 


It is common to be worried, especially when your family needs heat. You might think that it’s a signal that your furnace is starting to fail. But before you panic, let’s assess the reasons behind this as a protocol for furnace emergency preparation. 


How Does A Furnace Function?


Before answering your question, “Why won’t my furnace turn on?” let us first dissect how your furnace works. This way, we can further understand how it functions and what could possibly hinder its operation.


When your indoor temperature starts to stoop lower than your standard thermostat settings, the thermostat kicks the system to power on. It is because it detects that your temperature is below standard. As this happens, the combustion procedure begins and ignites the system. The fire (heat exchanger) then heats the acquired indoor air. After that, the blower fan disperses the warm air to your home. As for the by-products of combustion, they exit the system through the flue pipes. 


What Could Be the Cause of my Furnace’s Malfunction?


And so your query remains: “Why won’t my furnace turn on?” While no one answer fits all, we would look into each possible culprit. 


The first possible cause is your thermostat. As mentioned above, the primary component triggers the control board to power on. Hence, if you have a faulty thermostat, your furnace will not function. A dirty air filter can also be an issue. Filters must be replaced regularly and have proper cleaning. Because when dirt and dust build-up, they hinder the air path. When the system does not have sufficient air, it overheats and causes your furnace to remain shut. 


A problematic circuit breaker could also hinder furnace function. As each component may be connected and run by electricity, fried wires can stop overall operation. The same thing happens when you have a blown fuse. Hence, it is essential to keep this in check. Last but not least, triggering the pressure switch can prevent your furnace from turning on. It is a safety feature installed within your heating system that senses if by-products have proper dispersion. Since flue gasses can initiate health issues, your furnace stops itself from working when it detects improper exhaustion. However, there are instances when this safety feature is incorrectly triggered. Hence, checking it is also essential.




Placing a call to your trusted technician to ask them about the issue is not a bad idea. It is beneficial to diagnose and amend the issue before it worsens. Just be reminded to hire a licensed contractor to prevent further damages to your furnace. It is also essential to regularly schedule your furnace maintenance to prevent any possible issues from arising. It will help you save money from costly repairs or replacements. 


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