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Hiya I have been very lazy and only just got around to buying this part! My dad is going to replace it and has downloaded all the relevant info!! I have just one quick question - When we open the diverted valve housing to replace valve cartridge, do we need a new gasket to seal it again...

I have a Ideal Isar H35 combi boiler and have had a problem with the radiators being warm intermittently even when the timer is switched off! I've spent ages researching this and experimenting and have decided its the diverter valve within the boiler thats at fault. When the boiler ignites to...