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[tonyt47]

baxi 150e --when heating is on there is a loud droneing sound which goes when hot water is turned on and pressure drops from 2 bar to 1.5 bar but when hot water is turned off pressure rises back to 2 bar and noise returns ---any help please

[htg engineer]

Does it ever go higher than 2 bar ?

I would get the gas pressures checked by an RGI first, it sounds as though the gas valve is staying at high rate in CH mode, with DHW the heat is lost quickly - 0.5 rise in pressure is normal when the system is hot.

htg