When Your Furnace Won't Work

My furnace isn't working, what could be the problem?

If you smell gas, open doors and windows, leave the house immediately and call Enbridge Gas to report a possible gas leak. (613) 745-9181.

Have you checked the filter?

90% of our service calls are generated because of a blocked/clogged furnace filter. Check your filters a minimum of every 3 months. If you haven't changed it in at least three months or more, or you can't see through it when held up to the light, it's time for a change. Give us a call and we will be happy to put aside some replacement filters for you. If you have an electronic air cleaner, check that filter as well. Remember, never run your equipment without a filter! Depending on the household, check the filter every month - obstructions will cause your furnace to run harder than it needs to, at a reduced efficiency, and increase your running costs year round.

Is your thermostat set properly?

Make sure it is calling for heat (the temperature is set above the current temperature you house is reading, usually an additional 5 degrees to see if the furnace starts), and that the batteries are not dead. Check your thermostat manual for operation guidance if you're not sure, as well as the troubleshooting section for error codes. Is the furnace switch and breaker on? Sometimes furnaces have a toggle switch that looks like a light switch (usually at the bottom of the stairs or on a wall by the furnace); ensure that it is in the ON position. Try flipping the furnace breaker off and back on in your electrical panel. Is the furnace door shut? Most furnaces have a switch that triggers the furnace to shut off when the front door panel is open. Try taking the front panel off and putting it back on, even if it looks like it's closed.

Is the venting obstructed?

In high efficiency furnaces, the venting is normally done through a wall to the outside - check and ensure this is free of ice, snow, or other obstructions.

Is the fan running?

If the furnace is not heating but the fan is running, check your thermostat and make sure that it is not set to "fan on". If you reset the power to the furnace and your fan comes back on but still no heat, your furnace may be overheating - check all of the above. If you are getting intermittent heat and the fan runs all the time, your furnace may be cycling on limit (overheating and then shutting off; the fan still runs to cool it down). This problem necessitates a service call.

If all of the above have been checked with no result, it's time for a service call. Make sure to tell your provider what you have tried to narrow down the possible causes. Finally, the best way to avoid service calls is to keep your furnace properly maintained - changing your filters frequently, get yearly cleanings, and maintenance will ensure you get the maximum efficiency and longevity out of your furnace - not to mention ensuring your warranty will be valid should you need service and parts. Manufacturer's do not honour problems caused by neglect of maintenance or abuse of the furnace, so yearly cleanings are always advised. See our maintenance / taking care section for more details.

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