Why is my HVAC running when thermostat is off?

If your AC system short circuits, the commands you enter at your thermostat likely aren’t getting passed onto your system. So, if you turn your AC “off” at your thermostat, that command isn’t registering with the fan or cooling system, causing your AC to stay on when you’ve told it to shut off.

What happens when your AC won’t turn 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 would my air conditioner keep running?

If your inside unit’s evaporator coil is dirty it makes it tough for refrigerant (or “Freon”) to absorb heat from your air. A dirty condenser can block the release of absorbed heat from the refrigerant. Basically, both issues will cause your system to run constantly since it’s struggling to remove heat from your home.

What causes air conditioner to keep running?

One of the most common reasons an air conditioner runs constantly is restricted airflow. Your AC needs a certain amount of airflow in order to supply your home with cool air. If something is blocking the airflow to your AC, your system will run longer in an effort to bring in a sufficient amount of air.

What happens if you turn off the a C compressor?

A power failure or turning off the breakers will of course shut it off immediately. Restart protection in the thermostat or condenser. It waits to turn on until the high side pressure has dropped down to help unload the compressor at start up. Yeah, I know about the restart protection in the thermostat, as the original post indicated.

What happens when you turn off the thermostat on a heat pump?

The thermostat reaches the desired temperature, the indoor unit shuts off, the air stops blowing, but the outdoor unit keeps on running. In the heating mode (if it’s a heat pump) it could eventually shut off on a high pressure safety device.

Why is my air conditioner not turning off?

However, if the contactor isn’t working fine then the air conditioner compressor won’t turn off. Even though the thermostat might turn off the compressor still keeps running. That happens because a heated contactor can lead to several issues. Such as the contactors sticking together or getting shut in a closed state.

Why does my freezer not turn on when the compressor is running?

You may have a problem with your evaporator fan motor, which ventilates the evaporator coils during the periods the compressor runs. It is supposed to turn on when the compressor does, and you ought to be able to hear the fan in the freezer compartment, and feel the air moving in there.

Why is my air conditioner not shutting down?

Adjust Thermostat Temperature Settings Check the set temperatures on your thermostat – if the set temperature is lower than the current room temperature, the air conditioner cycle will not stop. Adjust the temperature up a few degrees higher than the current room temperature, which should trigger the thermostat to shut down the air conditioner.

What causes a fan and compressor to run continuously?

When the air temperature rises above a set point, the thermostat activates a switch to provide power to the fan and compressor. If the thermostat is defective, it may cause the compressor to run continuously.