Almost certainly Anita, your boiler is heavily coked up with carbon deposits inside....it will need to be opened up from the top and all of the baffles removed for cleaning - a very messy job! If you leave it, you can guarantee that it will fail to start up one morning soon. At the same time, an oil specialist (OFTEC) registered hopefully, will check and clean the burner unit for correct fuel pressure and air mixture, together with a nozzle change for good measure.
John (Oil burner engineer) March 2009 |