①Check the power supply, test whether the voltage and current of the access ladder control equipment meet the power supply standards;

②Check the credit card situation, you can test the device by brushing the card to see whether the elevator connection floor is controlled after brushing the card, so as to distinguish whether the device has brushed the closed card/closed the card during the period;

③Check whether the wiring, floor wiring, and connection cables between the main control device and the expansion board are in poor contact or falling off;

④If the fault persists, the device may be faulty.