Why Isn’t My Furnace Working?

While there can be many reasons why your furnace has suddenly stopped working, that hardly matters when your house is cold, and you want it fixed now.

The first questions that come to mind are typically “do I need to call for service” and “how much is this going to cost?”

If you would like to schedule an appointment for furnace repair, please call us at 763-515-6411 or schedule your appointment here.

If you would like to troubleshoot your furnace issue yourself before requesting service, below are a list of some very common furnace issues and DIY tips to try before calling us for service at 763-515-6411.

Furnace Won’t Turn On

Switched Off

Check to make sure that the switch hasn’t been flipped to “off.” This can happen accidentally, especially when changing filters.

Tripped Circuit

If that is on, then next check to see if the circuit connected to your furnace has tripped. If it is, reset it and check to see that the furnace then comes on.

Check Thermostat

If not, check your thermostat to make sure that it is set on “heat” and that the temperature it is set to is a normal winter temp (68-74 F).

If you have checked all of these things and it is still not working, it is time to call for service.

Fan Runs, But There Isn’t Any Heat

If your furnace is running but not producing heat, there could be several causes.

Water Heater Working?

If your water heater is working properly, then the gas supply is not the issue (if you have a gas furnace, that is).

Check Filter

Check your filter. Does it need changing? Unless you have a high efficiency media filter, your filter should be changed monthly, as it can cause your furnace to blow cool air and/or perform inefficiently if overly dirty.

If your filter is in correctly and usable, then it is time to call for service.

Furnace Runs But Shuts Off Before the House Is Warm

If your furnace runs and is producing warm air, but keeps shutting on and off resulting in a cold house, there could be several issues at play.

Your furnace has safety features built in to prevent it from overheating, and a professional HVAC technician can properly diagnose the problem.

Check Filter

Check your filter. Verify it is clean and installed correctly.

If your filter is clean, it is time to call for service.

Furnace Never Shuts Off

Check Fan

If your furnace is running continuously, first check to make sure that the thermostat is not set to “fan.”

If it is on “fan,” it will run without stopping. If it is not on that setting, then it is time to call for service.