Why Did My Furnace Stop Working?

So, it looks like your furnace has kicked the bucket? Well, let’s not jump to conclusions. There are lots of reasons that your furnace may have stopped working, but that doesn’t mean it’s done for.

Don’t go dropping all your cash on a brand new furnace just yet. Here are a few things to check before making any decisions:

1) Check your thermostat

The first thing you should do is make sure your thermostat is set to “Heat” and not “Cool.” It may sound obvious, but newer, high-tech thermostats can be complicated. Check your instruction manual if needed.

Next, set the desired temperature to 5 degrees more than the current room temperature. The furnace needs this difference to know it should come on and start heating.

2) Make sure your furnace is getting power

Again, this sounds obvious, but you’d be surprised how many of our On Time Service Pro techs get called and find out the furnace just wasn’t turned on. 

Check your shutoff switch and circuit breakers. All furnaces have a shutoff switch, either on the furnace or on the wall nearby. Make sure the switch is set to “on.” If it is, but the furnace still appears dead, check your circuit breaker.

3) Make sure the gas is on

Follow the gas line from the furnace to the meter. If you see a handle on the line that’s perpendicular, twist it so that it’s parallel. If your furnace pre-dates 1990, it may have a pilot light. If you notice that yours has gone out, read more about fixing pilot lights.

4) Check your filter

A clogged filter can cause the furnace’s heat exchanger—the part that heats the air—to overheat and shut off. 


Well, a dirty filter lowers airflow over heat exchanger, meaning it can’t take in enough air to keep it cool, so it overheats.

IMPORTANT: Always make sure your furnace is off when changing the filter. For extra precaution, we recommended that you set your circuit breaker to off.

Check your owner’s manual to see how to check and change your filter. If it appears clogged, replace it and try again.

Furnace still not working?

Okay, that’s frustrating. If you tried all those tips and your furnace is still not coming to life, then you should schedule an appointment with On Time Service Pros

The problem may be something more complicated, and we may be able to help you sort it out before you spend money on a new furnace. If you do end up needing a new furnace, we can help with that, too. We’ve been helping Minnesota residents for over 70 years. 

Best of all, we promise to show up on time, or the repair is free.

Schedule an appointment now or call us today at 651-254-8117.

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