Ideal Response 100 Combi problem

Hi - can anyone help with a Response 100 problem please.....? Boiler is 4 years old & was installed professionally, but has only worked for 3 years on & off. It keeps cutting and keeps flooding. Various plumbers have attempted fixes, eg to stop water condesation, flue needing adjusting to stop rain water flowing back in & flooding fan, new fan controller installed, replace pressure switch etc. etc. Ideal suggest a new heat exchanger is required at 300gbp. Ideal have done water tests & suggest radiotors need flushing - but this was done at time of fitting.
Is an Ideal 100 response boiler reliable ? Has anyone else had problems ? I understand from a local engineer, Ideal have stopped manufacturing the 100 'cos it was so cr*p.
Any thoughts / suggesstions all appreciated.
Thanks Pete
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