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boiler cutting out?

my ideal he 30 when on domestic hot water keeps cutting out. There is no alarm code and the central heating is fine. pressure in system is fine
geoff, June 2009
When a boiler cuts out on hot water only there are 2 reasons 1 the N T C is breaking down, must be replaced, 2 the heat exchanger is block or scale up, must be cleaned or replaced

capitalboilers.co.uk, June 2009