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Worcester Bosch 40CDi - Fault Code 5E?

I have this code 5E flashing on my display.

Other answers suggest it is a servicing scheduling problem, but my boiler was recently serviced on the annual contract just before Christmas ready for the winter, (its only the end of March now).

I have had cause for concern lately because the pressure has been dropping gradually. I have topped it up when it has dropped to below 1 Bar and I have checked all the radiators for leaks and have bled them several times over - they are all OK.

I have had it suggested that there may be a problem with the Pressure Relief Valve (PRV), (whatever that is).

Should I be worried? What should I do?

It is Easter weekend and getting someone out to look it over will be almost impossible until next week, so what should I do?
Brian, March 2013
Nothing to serious keep topping up to 1.2bar if goes down ,if you notice water drip from PRV than need change it PRV pipe goes out side the wall ,keep eye that there is no other leak in system

ltd, March 2013
link Click here to see other fixes for Worcester.