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how canm i fix error f22?

my boiler is doing the same, to get heating i have to fill the boiler with water, once the heating goes off the pressure drops and f22 appears, i have to do this everyday!! i have had 2 plumbers out now, both charged me for their services and its still not fixed, there are no radiators leaking and i cant see any leak coming from the actual boiler, any suggestions? is it definately a leak somewhere? i thought there was alot of water coming out the overflo pipe but ive been told this is normal?! please any suggestions are welcome!!!
HARSH from BIRMINGHAM, December 2010
Get one of the plumbers back to change the prv and re-pressure the expansion vessel

Carefree, December 2010