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Hi all , my son has the above alarm which has just developed a constant chirping sound , like a smoke alarm but without pause . I assumed it was the control battery but strangely when he turns off the mains the noise stops . He's disconnected both the mains and the back up battery but the alarm...

hi , since replacing the relief valve my boiler has become noisy , it sounds like a pulsing hum from the pump . it works ok but the pressure rises from 2 to 3 ( I think that's normal but not sure ). any advice gratefully received thanks.