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Noise from flue?

I have a PowerMax 155 boiler and each time the burners kick in there is a noise coming out the flue like a fog horn
albie, October 2010
Consistent with a poor gas/air mix, the gas valve tends to 'drift' out of adjustment. Probably due to lack of servicing.

Needs a competent RGI to set correctly

Carefree, October 2010