I have a similar problem. Mine started after a power cut and I just can't re-ignite the boiler. tried everything. It ignites and the burner comes on for approx 30 seconds then goes out..
Colin
March 2010
Look in makers manual gives guide for fault code ref flashing lights. If PCB , retails at rip off price £211+ Vat
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Try fixfault.com to fix home heating systems.