WHEN THE ROOM REACHES THE TEMP. SET ON THE STAT. THE HEATING REMAINS ON,TO DATE HAVENT TOUCHED THE THERMOSTAT ON THE BOILER ITSELF,ORIGINAL PROBLEM WAS THOUGHT TO BE THE ROOM THERMOSTAT,THE NEW ONE WAS NO BETTER.TROLLING OTHER SITES SUGGESTS THE 3 WAY OR THE MOTORISED VALVE STICKING OPEN. SPENT A FE...