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vaillant ecotech plus 824 R1?

my daughters boiler will not come on at all its displayin f75 we tried resetting it and turning it off at the mains any suggestions please
Lynn Rogers, March 2012
hi i have problem with hot water.when is run is very hot after minite is get lukwarm, diverter valve is fine. please let me know. bye

maqbool, December 2012
F75 no water in system ,fill water by filling loop under boiler to 1.2 bar and find out is water leak from PRV

ltd, March 2012
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