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When I say pulsate. Missus ran a bath and then after about ten mins the boiler just makes this noise that comes and goes every half a second. I can get the noise to stop by turning the heating on. And it all starts Woking fine again. I don't have a manual cause it's a property that I bought...

Every so often my boiler pulsates. The pressure is also at 0.5. Are these two things related and if by increasing the pressure will this solve my problem. And how would I do this. I have seen videos about pressure loop. I have photos on my profile of the pressure gage and under my boiler...