How to Repair an Air Conditioner That Isn’t Blowing Air

How to Repair an Air Conditioner That Isn't Blowing Air

When the scorching summer heat sets in, a malfunctioning air conditioner can be a major source of frustration. If your window air conditioner is not blowing any air, it’s time to roll up your sleeves and get to the bottom of the issue. In this advanced troubleshooting guide, we will explore some potential causes and provide steps to repair your air conditioner and restore the refreshing breeze it once provided.

Check the Fan and Fan Motor

The fan and fan motor play a crucial role in the air circulation process. Begin by removing the air conditioner cover to access the fan and motor. Ensure the fan motor turns easily and that the blades are undamaged. If the motor is seized or the blades are damaged, replacement is necessary. If the motor seems fine, but the fan isn’t running or is running too slowly, further tests are required. We recommend consulting a qualified professional who is familiar with using a multi-meter to check for motor defects or power supply issues.

Examine the Fan Motor Capacitor

The fan motor circuit in most window air conditioners relies on a run capacitor. If the motor hums or turns slowly, a faulty capacitor could be the culprit. To access the motor and capacitor, remove the air conditioner cover. Check for any signs of burnt or damaged wiring. If the capacitor appears undamaged, seek the assistance of a qualified technician equipped with specialized testing equipment to determine its functionality.

Assess the Electronic Control Board or PCB Assembly

If your air conditioner is running but not blowing air, and you have ruled out issues with the air filter and fan motor, the control board may be to blame. The electronic control board, also known as the PCB, operates the fan motor and compressor circuits using relays mounted on the board. Testing the power output from the relays requires a multi-meter and should only be conducted by a qualified individual. If the control board or PCB is found to be defective, it will need to be replaced.

Address Air Filter Restrictions

A common cause of an air conditioner not blowing any air is a clogged or dirty air filter. In a properly functioning unit, a fan draws air over the evaporator coils, cools it, and recirculates it into the room. However, when the air filter becomes dirty or obstructed, the evaporator coils can become excessively cold, leading to frost or ice formation. This restricts the airflow, resulting in little or no air being circulated. The air filter is typically located in front of the evaporator behind the front grille. Clean or replace the filter regularly. If the evaporator coils are heavily soiled, clean them using soapy water and a soft brush, while simultaneously replacing the air filter.

When your air conditioner fails to blow air, it’s important to systematically troubleshoot the possible causes. Start by inspecting the fan and fan motor, followed by checking the fan motor capacitor. If these components are functioning properly, assess the electronic control board or PCB assembly. Finally, ensure there are no air filter restrictions. Remember, if you’re not comfortable with advanced testing procedures, it’s best to seek the assistance of a qualified technician. By following these troubleshooting steps, you can regain the refreshing airflow from your air conditioner and enjoy a comfortable indoor environment once again.

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