worcester 9.24 electronic combi boiler

i have a Worcester 9.24 electronic combi boiler. the overheating cut-out keeps cutting out and i have to keep resetting it. not had any watermain work being done anywhere near or any other cause for loss of water pressure. any ideas what it could be. do i need an overpaid expert to suck his teeth and ask me who's had a go at this.it's cut out about 4 times in the last week.
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