Why is my heater not working in my house?

Dirty filters are the most common cause of furnace problems. Dust and dirt restrict airflow—and if the filter gets too clogged, the heat exchanger will overheat and shut off too quickly, and your house won’t warm up. If the blower is running but no heat is coming out, replace the filter.

Why is my heater on but no heat?

When you turn the furnace on but no heat comes out, there may be an obstruction. Dirty air filters restrict airflow, which can make it feel like not much heated air is coming out of your vents. Check the furnace filter and replace it if its surface is covered with contaminants.

How do I reset my heater?

How to Reset an Electric Furnace
  1. First, turn off the power supply to the furnace by turning off the breaker in the circuit box.
  2. Locate the reset button on the furnace and press it to reset the furnace. …
  3. If the button is popped up, press it down.
  4. Return the cover to the blower compartment and turn the power on.

What do I do if my heater is blowing cold air?

How To Troubleshoot Furnace Blowing Cold Air
  1. Step 1: Check Thermostat Setting. First and most importantly, make sure your thermostat is set to Heating Mode. …
  2. Step 2: Evaluate and Adjust Your Vents: …
  3. Step 3: Assess Furnace Filters and Replace Filters If They Are Dirty. …
  4. Step 4: Call An HVAC Pro.

How long do furnaces usually last?

15 to 20 years
THE AVERAGE FURNACE LIFESPAN

A well-maintained furnace can last at least 15 to 20 years, but completing annual maintenance and being diligent with repairs can extend its life even longer.

Why is my heating system blowing cold air?

A clogged filter is one of the leading reasons for a heater blowing cold air. But even if you swap the air filter with a brand new one, dirt and debris can still be found within the unit. This could eventually lead to overheating. If your furnace looks pretty dirty, call an HVAC provider for a professional clean.

Why is cold air coming out of my vents when the heat is on in my car?

Low Coolant Level

The coolant (usually a mixture of water and antifreeze) in your engine doesn’t just work to keep the engine from overheating: It’s also the source of heat supporting the heating system. If there isn’t enough coolant in your system, the heater core will blow cold air into your car.

Why is cold air coming out of my vents when the heat is off?

Cold air coming from vents when the heat is off is usually due to a simple setting on your thermostat. Generally, when this issue is happening, the “Fan” setting is set to “On” instead of “Auto.” When the fan is set to “On,” the furnace’s blower motor (fan) runs constantly.

How do you tell if you need a new thermostat in your house?

Signs You Need a New Thermostat
  1. Heating or cooling system will not turn off or on.
  2. The temperature reading is incorrect.
  3. Recent spike in your energy bill.
  4. Frequent temperature fluctuations.
  5. Thermostat is 10 years old or older.

Why is my furnace not blowing hot air?

Troubleshooting Furnaces Not Blowing Hot Air

Check batteries of your thermostat and replace the drained or faulty one. Check the fan settings on your thermostat if they are set to “auto” instead of “on”. Make sure someone else has not set your thermostat to a lower temperature.

How do I know if my heater core is clogged?

So it’s important to know the 5 signs to look for a leaky heater core.
  1. Your Car Smells Sweet. You may notice a sweet smell from your vents. …
  2. Your car windows become foggy. …
  3. Your car is blowing cold air into the cabin. …
  4. Your car is devouring coolant. …
  5. Your car’s cabin is cold, but the engine is hot.

How do you unclog a heater core?