While using the shower today, the main switch of our consumer unit
tripped. It has an RCD and none of the individual circuit MCBs
tripped.

When I switched it back on and restarted the shower, everything seemed
OK, except that the shower is not heating properly now. It does heat a
bit, but it is as though it is on a lower setting than it actually is.

The shower is a Mira Sport (9.5 KW I think) and is about 7 years old.
It's in good nick cosmetically at least and I'd like to keep it if
possible.

Any ideas what the most likely problem is and anything I can test to
confirm? Are parts easy to come by?

Thanks in advance for help.

--
Bob