An overload protector is a safety device within the compressor motor that shuts off power if the motor becomes too hot or draws too much current. This prevents the motor windings from burning out, which would require a total system replacement. Common causes of overload include a dirty condenser coil or a failing start capacitor. If your one zone wall mount unit is frequently cutting off, it may be the overload protector doing its job. Regular maintenance and keeping your outdoor unit clear of debris are the best ways to prevent this. You can find replacement electrical parts to keep your system protected on our website.