The reasons for the failure are as follows: First, check whether the controller is set up anti-stealth, interlock, emergency door and other advanced functions, please cancel those Settings, and then make a judgment: ① the key contact is not good; ② There is a problem with the door button, replace a door button to debug, if not for the above two reasons, the controller has a problem, please contact the designated maintenance point or send back to the manufacturer for maintenance.