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Worceter 24i junior boiler keeps locking out?

when i turn my hot water on the boiler keeps going to lock out. when i reset it it works fine for another few uses but it keeps reoccuring. can anyone offer me advice regarding this.
many thanks
Chris, September 2011
change hot water NTC and over heat thermostart
before changing make sure pump is running OK and fan

ltd, September 2011
link Click here to see other fixes for 24i.