there isn't a standard "red button" inside fridges in the way you're describing. The specifics of what a button does in a fridge can vary widely depending on the make and model of the fridge.
However, buttons inside fridges generally relate to features like ice making, temperature controls, humidity settings, or other specific functions. If you have a "red button" inside your fridge, it's best to consult the user manual or contact the manufacturer to find out exactly what it does.
However, if you mean a red switch or button in the fridge which is not directly attached to any obvious feature (like an ice maker or temperature control), it could possibly be a reset button or some other maintenance-related feature. But again, it would be best to refer to the specific fridge's user manual or manufacturer's guidelines to be sure.