If you are not getting any water through your shower it is possible that there is a restriction.
Please note that the air lock test is only neccessary if you're shower is the Pumped Digital Quartz or Quartz Thermo Mixer Shower and that you are on a Gravity Fed Water System (cold tank in loft).
The hose will appear fine from the outside,but the hose has an internal rubber liner which can become blocked/twisted.
To remedy this,unscrew the shower head from the hose anti-clockwise.Place the open end of the hose to it's lowest point (bath or tray).
Turn the water on.The water SHOULD come out in a straight line,if however the water comes out in a V-Shape the liner is twisted and the hose will need replacing.
Air Lock
If there is air in your pipework this will cause low flow and pulsing.To remedy this fault do the same above but run the water on FULL COLD for two minutes and then FULL HOT for three minutes.
If the water pulsates it is the air escaping.If it does this leave it until it corrects itself.
Hope that this info helps you,if it doesn't it sounds like you have a mechanical fault with the processor box.
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