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Yep, isolatyed by turning off fuel valve and switching off electrics at the isolator switch.......

Can anyone offer any advice? We have a Grant Outdoor Combi 90 boiler. 2 weeks ago we ran out of oil, had a delivery but the boiler chucked out plumes of black smoke out the flue and the chamber was gurgling! Called Heating Eng, who serviced the boiler, the chamber had oil in it!! so soaked up...