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hi i have a basi combo boiler i have just flushed the system,i put half a bar water pressure in the system because it should have one bar but for some un known reason it then goes up to 3 bar why is this and is it dangrous

model number M110.32SM/E hello i have to clean the heat exchanger in my boiler as the ch part works fine but hot water go's warm cold warm cold and so on can you tell me how to clean this out please do i take the part out of the boiler or not and what cleaner do i use after i have done this i...