When your air conditioning system keeps running and never seems to shut off, the problem could be linked to a number of malfunctioning components – frozen evaporator coils, a clogged air filter, a bad electrical relay switch that needs to be replaced, the fan blowing constantly, dirty condenser coils, a bad thermostat, …

Why is my AC running constantly?

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.

Why does my AC keep running after it reaches the set temperature?

A dirty condenser can make air conditioning continue to run after reaching the set temperature, in a similar way to a dirty evaporator coil. The accumulation of dust, dirt, leaves and other debris can impede the airflow. This can make the cooling system function improperly.

Why does my air conditioner fan keep running after I turn it 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 wont my AC turn off when it reaches the set temperature?

The most common reason that your Air Conditioner fan won’t turn off is because a stuck relay keeping the circuit closed. … Set the desired temperature above the current room temperature so the air conditioner unit turns off (set the thermostat below room temperature in the winter to check your furnace).