If you are experiencing an F1 error in your AC, it can be very frustrating. Fortunately, there are a few steps that you can take to try and fix the issue before seeking professional help. First, check your thermostat settings to ensure that all of the settings are correct. Additionally, make sure that all of the wires associated with the unit have not been damaged or disconnected. If these two steps do not resolve the problem, then it is likely due to a faulty capacitor or contactor within the system's internal components. In this case, an HVAC technician will need to be called in order to properly diagnose and repair any issues with these parts. Once they have diagnosed and repaired any problems with these parts, your AC should run smoothly once again!