Why does my HVAC fan keep running?

AC Unit Is Too Small Or Unable To Match Settings A too-small HVAC system will often run to keep up with the thermostat setting, leading the fan and blower to run consistently. Additionally, if your area is facing extreme temperatures, your HVAC unit may not reach the desired temperature.

Why is my fan running when my thermostat is off?

Over time, relay switches can become stuck or damaged, preventing the thermostat from communicating with the fan. Essentially, this means that the fan isn’t receiving the commands you’re relaying to the thermostat. So even if you turn your AC off, the fan will continue to run.

Why is furnace fan running non stop?

If your fan limit switch is set to AUTO but the fan continues to run without ever stopping, you’ll need to call a professional. Two problems that could cause your fan to run without stopping include: A bad fan limit switch that needs to be replaced. Bad thermostat wiring.

How long should my AC run after reaching temperature?

15-20 Minutes
An Air Conditioner Should Run for 15-20 Minutes at a Time. In a perfect situation, an air conditioner should run for 15-20 minutes at a time in mild temperatures. Any less than that and your AC could be too large for your home – more on that below.

Why does my air conditioner keep running when the fan is turned off?

However, if your fan is set to ON instead of AUTO, it will continuously blow, regardless of whether the cooling component of your AC is on or not. To see if this is your issue, check your thermostat and ensure that it’s set to AUTO instead of ON.

Why does my thermostat sound like the fan is running?

When the thermostat is set to Fan On it may sound like the heating or cooling is running even when it isn’t. Make sure that the Circulating Fan feature is not active.

What should the fan setting on my thermostat do?

The fan can use just as much as your refrigerator if you are using it all the time. Setting The Fan To Auto: This is a much better option. The fan will kick on and start to run when the unit deems it necessary and only run for a shorter amount of time.

What does it mean when Furnace Fan is still running after temp?

As a result, the fan will continue to run. On the other hand, if you notice that your furnace is still running after it reached your desired temperature, it means the furnace is not getting the message that it’s already accomplished its goal.