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What To Do When Your AC Unit Won’t Shut Off

High efficiency modern AC unit installed outside of a home

When the summer heat soars, an air conditioner is essential for maintaining necessary comfort in your home. However, while you want your AC to run reliably, it shouldn’t be running constantly. If your air conditioner won’t turn off, then there’s an underlying issue with your unit that needs to be addressed.

If you find yourself dealing with an AC that won’t shut off, our team at Maeser Master Services is here to help! We have put together this guide to explain the common causes of this problem, how to fix it, and when to call a professional for AC repairs.

Common Causes of an AC That Won’t Shut Off

1. Thermostat Issues

Thermostats are one of the most common culprits for an AC that is constantly running. Sometimes, the thermostat might be set to “On” instead of “Auto.” In “On” mode, the fan runs continuously even when the cooling cycle is not active. Also, a malfunctioning thermostat can fail to signal the air conditioner to shut off after reaching the desired temperature.

2. Dirty or Faulty Components

When airflow is restricted in your unit, your AC will have to work overtime to achieve the same level of cooling, which is why it might not be shutting off. Clogged air filters are a common cause of AC malfunctions, as they block airflow and cause the air conditioner to run longer to achieve the desired temperature. Dirt and debris on the evaporator coil can also impede heat transfer, making it harder for the AC to reach the set temperature.

3. Refrigerant Issues

Refrigerant is necessary for getting air to cool down before it is circulated through your home. Therefore, low refrigerant levels can prevent your AC from turning off as it will take longer to cool your home. Insufficient refrigerant levels can also cause the evaporator coil to freeze up, leading to prolonged operation as the AC tries to cool properly.

4. Electrical Problems

Your air conditioner comprises many different electrical parts and wires that need to be working smoothly. For instance, a malfunctioning relay switch can keep the compressor running even when it should be off. Also, loose or damaged wiring can disrupt the AC’s normal operation, including its ability to cycle on and off correctly.

How To Fix an AC That Is Constantly Running

Before calling a professional HVAC technician for repairs, try the following DIY fixes to see if they resolve the issue:

  • Check thermostat settings: Ensure the thermostat is set to “Auto” mode instead of “On.” Verify that the temperature setting is correctly adjusted.
  • Inspect and replace air filter: Clean or replace the air filter if it’s dirty. This simple step can improve airflow and efficiency.
  • Clean the evaporator coil: If accessible, carefully clean the evaporator coil to remove dirt and debris. This can improve cooling efficiency and help the AC reach the set temperature faster.
  • Check for obstructions: Ensure that the outdoor condenser unit is free from debris or obstructions that could affect airflow.

Try these fixes and then wait for a while to see if the problem is resolved. If the issue persists, you should call Maeser Master Services for an expert diagnosis and professional air conditioner repairs. We can fix or replace malfunctioning thermostats, recharge refrigerant, address faulty electrical systems, and much more.

Call Maeser for AC Repairs

When your air conditioner refuses to shut off, it’s often a symptom of underlying issues that require attention. While some troubleshooting can be done yourself, it’s crucial to know your limits and seek professional help when needed to avoid causing further damage or safety hazards. When it comes time to call a professional, make Maeser Master Services your first call! Our HVAC technicians can quickly get to the root of your AC problem and provide the fix it needs.

Reach out to Maeser today to schedule air conditioning repairs in Louisville, KY, or the surrounding counties, including Southern Indiana.

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