It would have been helpful to know whether it is the main RCD that trips or whether it is the MCB or micro circuit breaker?
When the RCD trips it is because somewhere in the circuit current is leaking away to ground. When the MCB trips it is because there is a short circuit - it is useful to know what to look for though in this case it is likely the element has failed as they sometimes do and it would probably be wise to check it first.
Answers & Comments
It would have been helpful to know whether it is the main RCD that trips or whether it is the MCB or micro circuit breaker?
When the RCD trips it is because somewhere in the circuit current is leaking away to ground. When the MCB trips it is because there is a short circuit - it is useful to know what to look for though in this case it is likely the element has failed as they sometimes do and it would probably be wise to check it first.