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Thanks for all the replies; I shall give it a try (except for the gas valve) and report back if it does happen again. What puzzles me actually; it happened the first time the boiler was installed. (on the first run) The engineer knocked the bottom of the casing, and it fired up. "That will be...

This is a condensing boiler about 1 year old. It is working ok, but about once a month the orange warning light on the control panel warns of flame failure of the main burner. I used to give the casing a knock, and it would fire up. Manually turning the boiler thermostat to on/off does fire it...