The cooker connects to a terminal black together with the hob. The feed then disappears into the wall and emerges at the consumer unit. Didn't want to believe both cookers could have a similar problem but will have to concede defeat and start testing the new cooker.
Thanks for the suggestion but I don't think a failed element caused the original problem because the rcd tripped without any of the heating elements being on, just the light. If it is a damp problem then maybe it will fix itself after being in the house for a little while.
The problem only happens when the cooker is switched on, the hob is on the same circuit and functions ok. The strange thing is that all I have to do is switch the oven on which only activates the light, none of the heating elements. It takes 30/40 seconds before the rcd trips.
After working ok for many years my cooker started to trip the CDC, not immediately but after a minute or so of being turned on.
Not necessarily the heating elements but just the interior light.
Thinking the fault was with the cooker I replaced it.
The new cooker does exactly the same.
I have...