Is your air conditioner not turning off?

Surely, everyone loves to cool off during the summers, but it is alarming when the airconditioner just keeps running. A number of faulty components can be the reason why this happens — clogged air filters, dirty condenser coils, bad thermostats, etc. Or, perhaps, it is problems with your HVAC system that cause your air conditioner to run without shutting off.  Learn all about it in this blog!

Reasons Your AC Does Not Turn Off

Here are some reasons why your air conditioner might not turn off:

  1. Electric Issues
    There are a number of electrical components in an air conditioner. A stuck relay is crucial for the electrical circuit to remain closed, and it constantly provides power to the air conditioner. Sometimes, the compressor contractor fuses in a closed position, resulting in the condenser unit continuously running with constant power — which means your air conditioner might not turn off. You may need help from a technician to replace the switch.
  2. Malfunctioning Thermostat
    Every 10 years or so, you need to replace your thermostat. The thermostat sensors might accumulate dirt, which affects their ability to give an accurate reading of the room temperature. Hence, the electrical wiring might be damaged, which leads to disrupted communication between the thermostat and the air conditioner.
  3. Incorrect Thermostat Settings
    It is possible that the fan is on, which makes it seem like your air conditioner is constantly on. When you select the ON fan setting at the thermostat, it powers the blower motor and the fan continuously — so even if the AC is off, you will hear the fan or the indoor components running while hot air blows from the vent since the air condition is not on.  Moreover, it might seem like your air conditioner keeps running because the set temperature is different from expected.
  4. Faulty Fan Limit Switch
    Even if you select the correct fan settings, the fan monitor can continue to run even when the air conditioner is not cycling. This might occur when the fan limit switch gets stuck in the override position. You can reset the limit switch, which you will find near the blower fan, to stop this.
  5. Dirty Condenser Coils And Condenser
    When a home is being cooled, the hot air passes over the indoor coil, and the heat is extracted. The refrigerant runs through the lines to run to the outdoor unit of the HVAC, and the compressor applies pressure on it before it moves to the condenser coil. Condensor coil might collect dust and debris, which affects the refrigerant’s ability to release heat. When the condenser coils become dirty, the cooling power of the air conditioner is limited. As a result, the system has to keep running to keep each room cool.

The outside condenser could also become blocked by debris, which means there will not be any heat movement through the unit to release heat. Airflow is disturbed, and your air conditioner might not turn off as a consequence.


Your air conditioner might not turn off for a number of reasons, and it is best to consult a technician and get the problems resolved. Crump AC and Heating have what you’re looking for; talk to us now at (281) 533-9200 or give us a visit at 535 E Fernhurst Dr., Ste 312, Katy, TX 77450.

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