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Hi Bob Oh sorry, the model is 828E. One more detail I noticed is that the pressure keeps going down closer to 1, after a day or two and not sure why. Could this cause this problem? Many thanks Rgrds Bashir

Hi All I have recently installed a Honeywell CM927 to control my Vaillant Combi boiler. Few hours later my wife screamed from the bathroom as no hot water in the shower. After switching off & on the boiler, later on everything worked fine. A couple of days later, the same thing happened. No hot...