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Troubleshooting a Furnace That Won’t Turn On


Nobody wants to get trapped in the winter in a house with a furnace that won’t work. There’s good news, however. If you have a failed furnace, you can rely on our team for any heating repair in Hillsboro, OH you may need. We offer 24-hour emergency service to make sure you won’t get stuck for too long with a non-working furnace.

But we also know that you don’t want to have to call us unless you really need to. In some cases, a furnace that won’t turn on or provide any heat has a simple source you can correct on your own. In this post, we’ll go over some of the troubleshooting steps to follow when your furnace isn’t heating your house. 

Important note: These aren’t repair steps—you shouldn’t attempt to open your furnace and use tools to fix it on your own! It’s potentially dangerous. Once you’ve gone through these steps, it’s time to call us for the professional assistance you need.

Check the furnace switch

The furnace has a dedicated breaker switch located near the cabinet which is used to shut down the unit during the off-season so it can be serviced. If this is the start of the season, you may have forgotten to turn the switch back on.

Check the electrical panel

One of the most common reasons for a non-responsive furnace is a tripped circuit breaker. Yes, this applies to gas furnaces as well, as modern gas furnaces have numerous electrical components and use an electrically powered blower fan. Reset a tripped breaker and try the furnace again. If the furnace continues to trip the breaker, call for repairs.

Check the thermostat

Often, a mistake with thermostat settings can account for a furnace failing to turn on when needed or only running for a short time. Make sure the thermostat is set to “heat” (often “auto” won’t work) and the target temperature is higher than that of the house. If the thermostat is showing a blank screen, it may need to have new batteries. 

Check the gas supply

See if there is gas running to your house and to the furnace. You may need to turn on the gas valve near the furnace if you haven’t used the furnace in several months. Don’t attempt to tamper any further with the gas controls for the furnace. 

Change the furnace filter

This filter is designed to prevent debris from entering the furnace through the return air duct. Since the AC usually uses the same filter, it can be already clogged up by the beginning of the heating season. If the filter is too congested, it will often cause the furnace to shut down to avoid overheating. Put in a clean filter to see if this solves the problem. (And you should put in a clean filter at the start of the season no matter what.)

At this point, you’ve done all the troubleshooting to find a simple cause for the problem. Give us a call and we’ll see you have your heating restored fast.

Rely on Shafer Heating & Cooling, LLC: You are just one call away from the comfort and savings you deserve!

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