TOOK OUT A GALAXY 3000 SHOWER DUE TO POWER LIGHT NOT STAYING AND SHOWER RUNNING COLD UPGRADED TO AQUA 4000SI FINE FOR FIRST SHOWER BUT LOW PRESSURE LIGHT COMES ON intermitant. COLD HOT!!! COLD SELECTED, PRESSURE LIGHT OFF! MED OR HIGH SELECTED PRESSURE LIGHT ON SOMETIMES!!! ON HIGH DIAL TO No 2 MOVING IT UP AND DOWN CAN GET THE PRESSURE LIGHT TO GO ON AND OFF!! MAINS FED PRESSURE IS 2.1/2 BAR.FILTERS AND FLOW ARE FINE.worked OK JUST NOW!! FOR 5 MINS BUT PRESSURE LIGHT BACK ON INTERMITANT OR STAYS ON ANY IDEAS
