boiler drain

Joined
3 Feb 2007
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Middlesex
Country
United Kingdom
what is the best way to drain a prisma combi boiler so i can repressure the air also the boiler still sounds active when there is no heating or hot water being called for
 
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not really sure what you mean by pump over run im guessing this means the pump stays active for a certain time after the system has been used. seems to be making a noise long after the system has stopped thanks ps any help on draining boiler
 

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