Hi.can somebody tell me what could bewrong with our electric shower.its mira sports thermostatic.last few days it stops while running.low light comes on but sometime it stays on.once rcd tripped.today i was in middle of having shower and it stopped.power light was on but water was cut off.i tried to switch it on and of few times.it worked few minutes then off again.power light is comming on but does not switch water on.