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Hello, Did sound come from inside or out?
Are there any lights flashing in front of indoor unit, If yes that will be a error code that will need to read, look for Color of lights, how many flashes between each pause, and light or lights are under what name.
Do you have any lights or beeping sound when you turn on with remote?
Need you to turn off the breaker for 1 min, turn on and see if we got a reset
Your Daikin probably still hold a warranty depending of when you bought it, 6 years parts and labour here in Canada. and up to 10 years now. Sound could indicate a possible part failure and refrigerant leaked out, that would disable unit. I can guide you how to check if it leaked out.