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glow worm boiler overheats and cuts out?

when iturn my boiler on i get about 20mins running the pipes go very hot then it trips out its had new thermostat anyone know the awnser please its a conventinal boiler
mr peet, August 2008
Check High limit thermostat & pump overrun.
Is the system open feed & vent, if so check the expansion tank is not dry.

johneboca, August 2008