To save money on a garage door repair, you can try a few troubleshooting tricks before calling a professional. Clean the sensor eyes to ensure a clear connection and check if there are any obstructions blocking the sensor. Adjust the sensor alignment if necessary. Check and adjust the open and close limits settings. Properly maintain the track and rollers by cleaning and lubricating them regularly. If these troubleshooting steps don't work, it's best to consult a professional before attempting any extensive DIY repairs.