Why Is My Furnace Not Turning On?
A furnace should last a long time (15-20 years), so if yours isn't turning on, it could need some repairs. Dirty filters, cracked heater exchangers, and regular wear and tear are common reasons a furnace might not be turning on.
If the problem is small, there are some DIY fixes, but it's usually recommended that you get professional assistance so the issue can be resolved quickly and efficiently.
Here's a checklist of some steps to take and things to consider when your furnace is not turning on:
The most important thing you can do is immediately address the problem. Ignoring your furnace issues might cause further damage, so don't delay getting your home warm again.
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Checking the Thermostat Settings
If your furnace is not turning on with a thermostat, incorrect thermostat settings may be the problem.
You'll need to check if the thermostat's temperature setting is only slightly greater than twice the current indoor temperature. Anything below these settings can be the reason the furnace isn't starting to heat up.
If adjusting the thermostat setting doesn't spark your furnace to start, take these steps with the thermostat:
- Ensure the heat setting is turned on.
- Check if the fan setting is on auto.
- Check that the temperature setting is not so high that the furnace cannot accomplish it.
- Make sure the temperature setting is above room temperature.
Inspecting the Power Supply
Issues with the power supply can affect both gas and electric furnaces. Inspect the circuit breakers and power switches to check if the furnace is receiving power. If you don't see the problem (and solution) here, it's time to call a professional. Your power supply may be due to issues with fuses and electrical connections, which require an experienced technician to resolve.
Addressing Common Issues With Gas Furnaces
If your gas furnace is not turning on, it might be due to a problem specific to gas furnaces, such as a closed gas valve or pilot light issues.
First, check if the gas supply is on. Your gas furnace has a gas valve on-off switch that looks similar to a light switch. Make sure the handle for the gas valve is running parallel to the line when it is in the on position.
If that doesn't fix your furnace, the next step is to check if the pilot light or igniter is functioning. To relight your pilot light, follow these steps:
- Review your furnace's instruction manual.
- Turn your furnace off.
- Wait 5-10 minutes.
- Turn the knob from "off" to "pilot."
- Hold the reset button and relight the pilot simultaneously with a long-stemmed lighter. When the flame catches, release the reset button.
If you feel uncomfortable tackling this sort of task yourself, consider bringing in a professional and licensed technician to do it safely for you.
Diagnosing Problems With Electric Furnaces
If your electric furnace is not turning on, this could be due to specific issues that impact electric furnaces, such as a malfunctioning heating element or a tripped breaker.
Try resetting the circuit breaker by turning off the furnace, waiting 30 seconds, and turning it back on. If that doesn't work, you may need to inspect if any circuit breaker parts are faulty and need replacing.
Remember that complex electric furnace issues can be dangerous, causing injuries or electrical fires. This is why it's always recommended that a professional technician be involved.
Identifying and Resolving Other Potential Problems
Lastly, some other common reasons for a furnace not turning on include a dirty air filter or blocked vents.
Checking and cleaning the air filter on your filter annually is critical. It reduces the chances of future problems with the appliance and helps improve its efficiency. Additionally, ensure vents are unobstructed so the furnace can operate properly.
If you want your furnace to last closer to 20 years versus 15, consider scheduling regular professional maintenance. These checks will prevent future furnace issues and increase the longevity of your appliance.
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