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how can I fix Camray 5 Oil Boiler belching black smoke ?

Oil boiler locked out when rean out of oil, now have plenty oil and boiler has been bled and started OK. It then started to belch black smoke from the exhaust, radiators will not heat up and no hot water. Can you advise please?
Robbie Blair, December 2008
You will find that the nozzle has coked up you will need to take out the burner and clean the nozzle ar better still replace it .

steve........., February 2009