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hi i have a valliant 110 which wont kick in just saying F 28 on display anybody out there know what fault that is cheers chris

hi Im looking for some advice on a britony combi 80. When the hot water tap is turned on the radiators warm up and the hot water system stays cold now according to the fault finding page in the installation manual this fault is down to the 3 way valve? Which has now been changed but fault...