Fix Fault Redring

My shower is flashing L

the dial on the shower won't move. No water coming through although the cord from turning shower on is on.

It makes a knocking/rattling noise for the first 30 seconds or so when you first switch it on & I think the pressure is lower than normal.

redring 8x shower only supplies cold water

when shower switched on on light is lit high setting light is lit but medium setting light not lit with shower on high setting, shower unit is a redring expressions 5005 unit

My shower begins to power up and after approx 10 seconds it shuts down completely any ideas guys plz

The water does not heat up. What do i need to check

We are using a redring expressions 500 and it has just started to lose heating power. The overheat light is not on, but it just produces warm instead of hot water on all settings. Any idea what might ... more