I got a problem with 1 of my alpha ceiling fan. whenever i tried to press the speed fan button, i'm not able to get it to startup the fan but pressing the natural button will startup the fan. But if I hold the speed fan button and like walk around the fan a few round and sometimes i will hear the beep sound to startup...Not all the speed button cant work

any idea whether it got to do with the sensor or is the fan already faulty?

ps: i tried to use other alpha's control but still cant work