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Boiler cutting out after two mins?

Hi I have a Potterton prima 40b and it fires up ok but after about 2 to 3 mins it cuts out. Any ideas? I'm thinking the over heat thermo stat!
D walker, July 2013
it cut out because its over heating ,is pump run , could be air in system ,vent all radiators make sure water comes out,enough water in system

ltd, July 2013
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