In this case LED1 indicates the timing sequence has started. LED2 indicates power and then is blinked to indicate the timer is running in the 55 second loop. Mostly this is for visual troubleshooting. A Third LED might be utilized to avoid confusion going forward.When does LED1 get turned off?
After pressing SW1 and turning on LED2 and waiting for 3 seconds, why would you need to turn on LED2 again when you activate the relay? Is this a typo?