I have hot water everywhere except my electric shower which comes out luke warm.

However if I heat my water using the immersion switch the water comes out hot from the shower?

I just had to have my boiler mother board replaced but I can't see how that could have affected it.

Any ideas most welcome.

Andy

If you have hot water out of the boiler in the rest of the house perhaps the hot water feed to the shower was shut off when the mother board was replaced. Tom