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Gas glow worm micron boiler, hot water tank, 3 port valve, siemens landis and staefa thermostat

Can anyone help? When the heating turned on, it is on full blast all the time. All the radiators are red hot (you can smell the heat) it doesn't seem to matter what the ratiators are set on, they are never just luke warm even when set on just 2. Also the heating doesn't click off when it's...