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The GEC nightstor 100 is a wet system boiler it weighs 9.8 of a ton and has 168 bricks inside which heat up during eonomy 7 period on a full charge the core can reach 1000c, when the ocupier wants heat during the day a fan starts and draws heat from the bricks and and puts it through a heat...

Hi Rosie sorry to hear about your boiler it could be one of many problems it depends if your rads are hot when it trips of as it could be the water temp sensor not sensing the tempature and as you have had the pump changed and the system flushed i would suspect the pcb as the pins through time...