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Pressure relief valve keep's discharging ??

The pressure relief valve has been replaced 3time's in as many year's.What's causing it to discharge?Could it be the boiler stat?pressure remain's constant at 2bar...Thank's for any suggestion's .

Joe.Boiler make:Halstead Ace Combi.
November 2014
Heating, Home Heating SystemsPressure Valve Boiler

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Boiler Relief Valve Keeps Discharging - Help!