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My boiler, a Glow-worm Space Saver 50, has the following symptoms, Black fumes from the flue, Casing getting too hot, flame burning yellow and poor efficiency. This has been getting worse for a few weeks, I have now stopped using it. I hope it needs just a service or at least a good clean out, this has not been done for about 10 years. Could anyone help, is this feasible as a DIY job?