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Fitted new wax capsule two days ago and boiler seems to be back to form. thanks for your advice much appreciatted

Thanks for the reply but when you say diverter valve is this the flow switch in the manual.Do i replace the valve or does it contain parts that can be replaced,i.e diagpham,wax capsule(thermostatic element)? thanks mick

System is:vcw-sine 18 t3 w (gc- no. 47 044 01) While running the hot water tap the radiators get hot without the heating being on. I have looked through the forum but still confused as to what part fault could cause this. I have an instruction book and thinking if this is a diy job (i know...