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Ketteling?

How do I stop my Halstead Best 50 Open vent Boiler from Ketteling? I have checked the Heat Exchanger for Scale Treated with de scaler, no scale present.
Cliff Cripps, January 2010
lower the gas pressure on going to the burner this should help.it will take slightly longer to heat up but should stop ketteling

conor, January 2010
link Click here to see other fixes for Halstead.