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5 Common Furnace Problems in Minneapolis

5 Common Furnace Problems in Minneapolis

If you live in the Twin Cities, you already know the importance of a working furnace—especially in the winter months.

Since we service hundreds of furnaces every year in the Minneapolis–Saint Paul area, we regularly notice 5 types of furnace problem symptoms:

  1. Room temperature doesn’t match thermostat setting
  2. Room temperatures fluctuate
  3. Furnace only blows cold air
  4. Furnace airflow is weak
  5. Rattling, squeaking and rumbling sounds coming from furnace

Let’s go into more detail about the symptoms of each problem and how to solve them.

Symptom #1: Room temperature doesn’t match thermostat setting

Problem: This usually means that the thermostat is not calibrated or that it is installed near an overly hot or cold area of the home, which causes the thermostat to give an inaccurate reading.

Solution: You can check your thermostat’s calibration to see if it is accurate. If you have any trouble doing this, or you need to replace your thermostat, you can contact a heating expert for more help.

Symptom #2: Room temperatures fluctuate

Problem: If your thermostat is set at one level and the room’s temperature is rising or falling more than 3° Fahrenheit, the heat anticipator on your thermostat needs to be adjusted or replaced.

Solution: If you have a digital thermostat, try replacing your thermostat’s batteries. If you still notice a big fluctuation in your room’s temperature, call an HVAC professional to take a look at your thermostat’s heat anticipator.

Symptom #3: Furnace only blows cold air

There could be various problems causing your furnace to blow cold air:

1. Problem: Your thermostat is set to ON. On this setting, the furnace blower will constantly run even when your furnace isn’t heating the air.

Solution: Switch your thermostat to AUTO and your furnace will blow only warm air.


2. Problem: It could be that your furnace is overheated. When your furnace overheats, the limit switch shuts off the burners while the blower continues running to cool off the furnace. 

Solution: Overheating furnaces are often caused by a dirty or clogged filter. Change your furnace filter. If your furnace continues to blow cold air, contact a heating specialist.


3. Problem: Your pilot light could be out. This means that there could be a problem with the gas line reaching your furnace. If your furnace has an electronic ignition system, there could be damage to the spark electrode, control module or other component of the pilot light.

Solution: Make sure your gas line valve is open (see images below). You can also try to reignite your pilot light. Before you do so, read the instructions included with your furnace to learn the correct safety precautions. If you are still experiencing problems with your gas valve or ignition system, contact an HVAC specialist for assistance.

Symptom #4: Furnace airflow is weak

Problem: You may have a dirty filter. Dirty or clogged furnace filters reduce airflow, which makes your furnace work harder to circulate hot air. You could also have duct leaks, which also limit the amount of hot air reaching your room. In a typical house, about 20 to 30 percent of the air that moves through the duct system is lost due to leaks.

Solution: Change your furnace filter. If the symptom still persists, it could be you have some leaks in your duct system or you have a bad limit switch. Contact a heating expert if you change your filter and you’re still not getting enough heat.

Symptom #5: Rattling, squeaking and rumbling sounds coming from furnace

Problem: If the furnace is making these types of noises or you hear the blower running continuously, there’s likely a mechanical problem with the furnace. It could be anything from an old furnace belt to an issue with the blower’s motor.

Solution: Let an HVAC specialist handle problems related to the mechanical components of your furnace. If you haven’t been trained on furnace repairs and you attempt to fix something yourself, you could void the warranty or cause a more serious problem.

Schedule your annual furnace inspection

During an annual furnace inspection, a professional will check for these common furnace problems. They’ll also perform general maintenance that can prevent these problems and other  serious hazards like carbon monoxide leaks. 

Schedule an appointment with us today to make sure your furnace is running safely and efficiently.

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