I have just replaced a light switch following decorating and the circuit breaker will not reset. The switch is correctly wired as i have checked. Even put the old switch back to check the new switch wasn't faulty. After about an hour of doing other things i returned to the problem and the mcb would reset. The circuit has never tripped therefore is it likely to be a faulty mcb? Apart from swapping it with the other light circuit is there some way i can check? don't want to have this issue again if it trips for real....candles anyone