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Just been to a customer where on of our installers fitted a new viessmann heat only. They have an issue with the boiler not switching on. Talking to the customer over the phone the problem sounded like a blockage so I suggested a powerflush. Anyway after today's visit I found that he has a Rayburn connected to the system and what was happening was that there was no flow through the boiler. Found this to be because the pump was pushing it round the hot water circuit and also round the Rayburn. I'm sure the Rayburn hasn't been fitted correctly. See attached pics. We have now sealed the system and fitted a 1.5 bar PRV as Rayburn only takes max of 1.75 bar. I had to fit a lockshield to the pipework of Rayburn into the heating system so water flowed round boiler and it fired up. Obviously Rayburn is not being used so it's ok for now until I can get a solution for this. So the customer wants to use the Rayburn to heat his heating and hot water and when that's not heating it then the boiler will. Can anyone tell me what is needed for this to work correctly