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Why does my AC fan keep running?

Jim Brown

Why does my AC 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.

What do you do if your fan won’t turn off?

If your furnace fan won’t turn off, you most likely have one of these 3 problems:

  1. Your furnace fan limit switch is set to “manual override”
  2. The fan limit switch is faulty and needs to be replaced.
  3. There’s a problem in your thermostat wiring.

Why is my AC running non stop?

A clogged filter essentially “suffocates” your air conditioner because it restricts the amount of air your system can bring in. This is what a clogged filter does to your AC. And if your AC system can’t breathe easily because the filter is clogged, it’ll run non-stop trying to cool your home.

Should the fan be on when the AC is off?

On the one hand, running your heating and cooling fan even when the AC isn’t in operation helps to circulate the cool air throughout your home. Doing so distributes it evenly, ensuring consistent comfort. It’s also worth noting that constantly turning the fan on and off can put your system through wear and tear.

Why will my fan not turn off?

Common causes for fans not turning off when they should include faulty thermostats, bad wiring, and stuck relays. These problems are not easy DIY repairs and should be left to an HVAC professional.

How do I know if my fan limit switch is bad?

The most common sign of a malfunctioning limit switch is the continuous operation of your furnace’s blower. Just as the limit switch won’t allow the fan to turn on until the warm air has reached the right temperature, the limit switch also shuts down when the air cools to a certain temperature.

What to do if your air conditioner fan won’t shut off?

Wait to see if the air conditioning unit fan eventually shuts off. If it does, the problem is not likely the thermostat. If the unit continues to run, it may be the thermostat. Remove and replace it with a new thermostat. Check the contactor relay switch.

How do you turn off an air conditioner?

Check the contactor relay switch. This component “tells” the air conditioning fan to shut off once the thermostat reaches a reading equal to the temperature setting. Turn the air conditioning unit’s breaker off at the main electrical panel.

Why does my AC fan keep running when the thermostat is on?

The blower helps circulate hot or cold air throughout your home until the temperature on the thermostat is reached. ON means that the fan is constantly on and blowing air when your HVAC system is not heating or cooling air. Herein, what causes AC fan to keep running?

When does the HVAC fan turn on and off?

In normal operation, when your thermostat is set to “auto,” it will tell the blower fan plus the heating or cooling components to turn on and off at the same time when the desired temperature is reached. In many systems, the blower fan runs a minute or so before heating or cooling begins and ends to get air flowing.

Why does my AC fan keep running?

Jim Brown

Why does my AC 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.

Should outside fan run when AC is on?

The outside fan sits on top of the condenser, which is responsible for converting the system’s refrigerant from a gas to a liquid so that it can flow through the system and cool your indoor air. Because it’s such an important part of your AC, you’ll want to make sure the outside fan is always in top running condition.

How long should fan run after AC turns off?

Your HVAC fan should turn on and off with the rest of your heating and cooling system. It’s normal for the fan to kick on a couple of minutes before heating starts or to stay on for a couple of minutes after cooling stops, but your fan shouldn’t run for hours on its own.

Why is my air conditioner not turning off?

The most common reason that your Air Conditioner fan won’t turn off is because a stuck relay keeping the circuit closed. If it’s not the relay, your thermostat likely has a shorted cable or needs to be replaced. Before calling your service technician out to start replacing components,…

Why does my AC fan keep running all the time?

NOTE: Sometimes entire air conditioner units (not just the fan) can run nonstop in an effort to reach the desired temperatures. Often, these inefficiencies are a result of clogged or restrictive air filters, dirty or frozen evaporator coils, dirty or blocked condensers, or low refrigerant.

When does the HVAC fan turn on and off?

In normal operation, when your thermostat is set to “auto,” it will tell the blower fan plus the heating or cooling components to turn on and off at the same time when the desired temperature is reached. In many systems, the blower fan runs a minute or so before heating or cooling begins and ends to get air flowing.

What to do if your Furnace Fan won’t turn off?

Consult a professional. If your furnace or AC fan is constantly running, call an HVAC professional as soon as possible. Trying to fix electrical problems on your own could cause more damage or even create a fire hazard. For a safe and fast repair, contact Petro Home Services.