Low pressure - nine.five

It may be your solenoid valve, you can check it if you have a multi meter, you should have a reading of at least k3.5 ohms, across the two terminals any less and you need a new valve. (Check the valve in the failed state.) (When it has stopped working!)

If there is power getting to the solenoid and it is not operating then there is a good chance that you have a faulty solenoid.

http://www.youtube.com/watch?v=NzJjzWqxesc

The video is intended as a guide and does not cover every shower.

If you don’t have a multimeter  we sell them  with a guide on how to use them for checking and testing the various parts of your shower.

Apart from helping to fix your shower, they are really useful for checking you have a power supply to appliances, for checking fuses and letting you know much power you have left in batteries

(So you will know if they are good or not) and lots of other jobs, in short they are well worth a few pounds

http://www.showerdoc.com/installation/electrical-products/SKYTRO-600-005-Digital-Multi-Tester

The other possibility is a faulty "Solenoid PCB" the usual fault but not always,  is no continuity on the neutral from the solenoid to the opposite side of the board

It is best to replace both of these at the same time New Team do a kit that replaces both parts.

http://www.showerdoc.com/shower-spares/newteam/NEWT-SP-092-2003-NewTeam-Solenoid-Valve---Pcb-(mk3)-SP-092-2003

Fitting the PCB and solenoid is not particularly difficult the only difficult bit is you have to replace a micro switch which is the centre switch in a row of three, they are operated by rocker type levers and a cam the fiddly bit is to make sure that the spring on the centre rocker is in the correct position and that the other levers all line up correctly

Take some photos before you start