First up, read the instruction manual for your particular RV keyless entry model to get it right first time. Your system will come with a default factory setting – more often than not 1-2-3-4. As a general rule of thumb, most RV lock codes can be set by using the following: - Hold down the 8 key (or key as instructed) and the lock button and release at the same time - Enter the default or existing code then press lock - Type in your new code (usually up to 8 digits) then press lock. - Hold until you get confirmation the code has been accepted – typically a long beep. - The new code should now open your RV door.