How do I reset my furnace?

Most furnaces can be reset using the reset button on the unit itself, but it's important to identify why it shut down before restarting it. A furnace that repeatedly needs resetting indicates an underlying problem that requires professional attention.

First, ensure it's safe to reset your furnace. Check for any gas odors around the unit - if you smell gas, leave your home immediately and call Enbridge at 1-866-763-5427. Also verify that your carbon monoxide detectors are working and haven't been triggered.

To reset your furnace, locate the reset button which is typically a red or yellow button on the furnace unit itself, often near the blower motor or on the control panel. Turn off the power to the furnace at the electrical panel first, wait 30 seconds, then turn it back on. Press and hold the reset button for a few seconds, then release it. You should hear the furnace attempt to start up.

Before resetting, check these common issues: Make sure your thermostat is set to "heat" and the temperature is set higher than the current room temperature. Check that your furnace filter isn't completely clogged - a dirty filter can cause the system to overheat and shut down. Ensure all vents in your home are open and unobstructed.

In Ottawa's climate, a furnace that won't stay running can be dangerous during winter months. If your furnace trips the reset button repeatedly, shuts down again after resetting, or if you're uncomfortable performing these steps, it's time to call a licensed HVAC technician. Common causes requiring professional repair include faulty flame sensors, blocked vents, gas supply issues, or failing safety controls.

If your furnace won't restart or keeps shutting down after resetting, don't keep trying - this could indicate a serious safety issue. For emergency furnace service in Ottawa, contact a licensed HVAC contractor who can diagnose and safely repair the problem.