I am having problems with it since one radiater was removerd and when refilled now only when water is hot heating dont work and when we switch heating on first then water will stay cold so i have tried bleeding the system i get air out from pump screw in middle and everything work for while then stops after few days someone said pump was not working properly but it sond that the switch which switches from water to heating is faulty but i dont know what the part is called and where it fits
