Yes. Open up the shower box (turn off the electric first!!) You can take out the PRD and put it back in. Might only work temporarily. But ideally get a new PRD from Gainsborough. Ensure that the shower head is clean of debris but taking the shower head off, cleaning it and letting the shower run cold water to get out any rubbish. Put the head back on and see if it work.
A, December 2009