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In last month, boiler has started whistling after using hot water. Run water, switch taps off, then get whistling while pump does its overrun. Gets quite loud but is unpredictable - sometimes whistles sometimes doesn't. Started happening after replaced dhw pressure differential valve...

New member here! Had pressure loss problems on Baxi 105he instant for months now. Boiler approx 2 1/2 years old. Have checked CH system and no leaks. Have repressurised pressure vessel and still getting pressure loss - down from 1 bar to under 0.5 bar in 3 weeks. Looked at forums and seems...