My cooker keeps tripping at the consumer unit. It does this without turning any oven or grill on. It's done it before but usually you just flick the rcbo back on and it works fine, but now nothing won't latch up atall. If I turn the isolator off behind the oven then it will go up. Turn the isolator on and it goes. My assumption is that this is cooker end. Before I tear the cooker apart,do the rcbo's go bad, I'm guessing not the case as switching the isolator off allows the rcbo to turn on.