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When winter is right at the corner, we need a reliable furnace handy. A fully operational heating system is necessary, especially with the brutal temperatures during Toronto’s cold season. However, it is inevitable for issues to pop up along the way. You might have asked, “Why won’t my furnace turn on?”

We know how frustrating it might be to encounter this issue when you need heating the most. But don’t fret just yet! This article will guide you through the possible reasons behind this and some quick fixes. Start reading before placing a call to your trusted technician.

Your thermostat is faulty. 

Checking your thermostat may end your constant question, “Why won’t my furnace turn on?” While we can’t guarantee that it is the actual issue, you must look at it. 

Your thermostat is the component that detects if the indoor temperature lives up to your preference. As a homeowner, you can adjust that based on your liking and the needs of the other residents. If your furnace is not turning on, it might be that the thermostat setting is at the wrong temperature. Wrong settings could be why it is not triggering your furnace to start heating. Another factor could be old batteries. Your thermostat will not be able to function if it doesn’t bear a sturdy power supply.

Solution: Adjust the settings and make sure everything is correctly programmed. If needed, replace the batteries or check the breaker if your thermostat is hard-wired. 

Your air filters are clogged.

Clogged air filters could also be an answer to, “Why won’t my furnace turn on?” While it is easy to ignore them, all homeowners must inspect their air filters regularly. 

Air filters function to “filter” thy air. Once the system acquires the indoor air to transfer heat energy, these filters rid them of pollutants such as dirt and dust. Over time, those accumulate and get trapped, which blocks the airway. Once there is insufficient airflow, the heat exchanger triggers an overheating of the system. If such is the case, your furnace can stop working as a safety feature blocks its function. 

Solution: Clean and replace air filters regularly. Always keep them in check as they can cause far worse troubles in the long run.

Your furnace might have run out of fuel supply.

Have you checked both issues noted above and still have no answers to, “Why won’t my furnace turn on?” Check out your fuel supply.

While it may sound simple, we frequently overlook things and complicate them. Before rushing to panic mode, inspect your fuel supply first to see if there is enough to have your furnace operate. A sufficient fuel supply is necessary for your furnace to function efficiently. Once your run short, it can trigger malfunction or failure to start the system.

Solution: One way to check this is by trying a different gas appliance. If the other device doesn’t work too, it’s a gas supply issue.


Are you still unable to figure out the answer to, “Why won’t my furnace turn on?” If such is the case, place a call to your trusted local technician for troubleshooting. Experts need to take over and check what possible issues your furnace could be facing. They can diagnose the problem and amend them as they see fit. 

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