True - but since we're told that it's not the RCCB which is tripping, it presumably must be an MCB. If that's the case, and given that the shower is working and nothing dramatic is happening, it's very difficult to see that the cause could be anything other than a faulty MCB, which just 'trips' spontaneously.
I wouldn't go that far - from afar, I can but speculate about what is probably the problem, so you definitely need to get it checked out and sorted out - since I could be wrong. In any event, if my suspicion is right, it's probably only a matter of time before the MCB gives up the ghost completely, in which case you won't be able to use the shower at all.
Right - as I had presumed. My belief remains that the B40 device itself is easily the most likely cause of the problem - but, as I said, you really ought to get it checked out, not the least in case I'm wrong and something more nasty is going on! As I'm sure you'll understand, without being there, I obviously can't be sure about anything.
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
