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Yippee, investigated the air switch, noted the position of the adjustment screw and then adjusted slightly in both directions and, hey presto, the boiler is now functioning normally. Thanks for your help. :lol:

Boiler has started to fail to fire intermittantly on CH and DHW demand. During last fail/ downtime did various checks/ inspections but did not find anything untoward. When in fail mode it may eventually fire but only after 2-5 mins of running tap seems less cooperative with CH demand but will...