I have a heavy duty shower pump in the loft which supplies a ground floor shower very satisfactory but will only supply the upstairs shower if I first turn on the ground floor one. Immediately that one starts the upstairs one will also start and keep going even if I then turn off the G/F one. For a little while I can turn the upstairs one on independent of the G/F one as long as I lower the hand held flexable pipe to below my knee, but after a day or so it will not turn on at all.

Thanks in anticipation

Tom Sullivan