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ferroli boiler comes on when cold tap is turned?

is it normal for the boiler to come on but only for a few seconds when the cold tap is turned on . on a ferroli optimax he plus 31c
mr d, September 2009
Sounds like you could have air trapped within the Hot Water Circuit somewhere, or you may need a small shock arrester vessel fitted to the cold inlet to the boiler

www.elanar.co.uk, September 2009
link Click here to see other fixes for Ferroli.