Firstly turn on switch1 for 1 minute, after 1 minute turn off the switch1, then turn on the switch2. go to the room and check the cases: case1: If bulb is on then switch2 is default switch. case2: Touch bulb by your hand if it is warm then switch1 is default switch. case3: If bulb is cold/normal then switch3 is default switch. default: No switch is working. ;)