Had similar problems on same model last year on 18 month old boiler. Problem found to be electronic board fault. New board fitted problem solved. If your unit only has a 12 month warrenty try to claim costs under the Sale of Goods Act ,this can be done on line(Money claim) and worked for me reclaiming £210 + cost of action £30.
Keep all receipts, ask repairer for brief written confirmation of defect, and keep defective part for examination if requested.
Good luck
Alan
August 2007
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