What causes AC fan to 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 would AC suddenly stop blowing cold air?

There are a couple of reasons for ice buildup in your AC — dirty coils or filters resulting in poor airflow, or a lack of refrigerant. If that doesn’t get the unit blowing cold air again, it could be refrigerant levels are low (see below).

What do you do if your air conditioner isn’t turning off?

When Your AC Won’t Shut Off

Check the Thermostat. You may find your thermostat not reaching the set air conditioning temperature.
Clean the Condenser. Your AC works by passing air over condenser coils which remove the heat from the air.
Have You Done Routine Maintenance?
Check the Fan Limit Switch.

Should the AC be on auto or fan?

Keeping your fan on AUTO is the most energy-efficient option. The fan only runs when the system is on and not continuously. There is better dehumidification in your home during the summer months. When your fan is set to AUTO, moisture from cold cooling coils can drip and be drained outside.

What is the reason for air conditioner running continuously but no cooling effect?

1. Clogged Air Filter. If your air conditioning system is running all the time without actually cooling, the first thing you should do is check the air filter. When your air conditioning system’s filter is clogged, it restricts the flow of air to your home.

What causes your air conditioner to stop working?

If your air conditioning unit has stopped working, there are many possible reasons that can explain why. It could be your thermostat, your air filter, a problem with the condenser or compressor, or it may just be time to replace the unit, especially if it’s over 10 years old.

What does it mean when your air conditioner won’t shut 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.

Why does my air conditioner keep running after it has reached the set temperature?

Blower Motor or Fan Issues An air conditioner may continue running after reaching its set temperature if there an issue with the fan or blower motor has arisen. It could happen that the blower motor may not be providing the correct volume of air, or the fan may be working too slowly.

What to do if your a / C fan won’t turn off?

At the room thermostat: the FAN-AUTO-OFF or FAN ON/OFF switch on the room thermostat should be checked. The fan control should be set to AUTO. You can try turning the switch to OFF too. Other snafus such as a shorted thermostat wire can also cause the A/C or warm air furnace fan to run continuously. at THERMOSTAT WON’T TURN OFF. 2.

What should I do if my air conditioner is not shutting off?

Check the fan settings on your thermostat – the toggle should be in the AUTO position so that the fan only runs while the air conditioner is on. If the thermostat fan setting is ON, move it to AUTO – with the temperature set above the current room temperature, the thermostat should tell the air conditioner to shut off as well as the fan.

Why does my air conditioner keep blowing cold air?

Temperature Control. If your air conditioner doesn’t shut off even though the set temperature has been reached, and continues to blow cold air, you may have a problem with the thermostat.

Why does my air conditioner fan keep running?

Other snafus such as a shorted thermostat wire can also cause the A/C or warm air furnace fan to run continuously. Those problems are explained at THERMOSTAT WON’T TURN OFF. 2. At the furnace or air conditioner air handler or blower unit: the fan limit switch may include a switch that manually keeps the fan running.

Why is my AC fan not turning off?

Temperature Control. If your air conditioner doesn’t shut off even though the set temperature has been reached, and continues to blow cold air, you may have a problem with the thermostat.

How does a blower fan work in an air conditioner?

Your blower fan is what pulls the uncomfortable air out of your home, sends it through the air conditioner or furnace, and then distributes it back into your home. The thermostat is what tells these separate systems to work together.