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Keston boiler lockout code E00?

Keston boiler C40 is fine on hot water only but when it goes onto central heating it runs for a while then goes into lockout....displaying code E00. Can be re-set and may run again all day. Any ideas ?
steve, September 2009
E00 means flame detected when not expected. maybe a faulty earth or flame detection probe.

Ian, September 2009