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Mend Potterton Powermax HE Boiler Heating Bleed Radiators

How can i fix my potterton powermax HE?

My potterton powermax HE boiler has developed a regular knocking sound every couple of seconds. I have been told it could be air in the system. I have bled the radiators but have now been told it could be air in the boiler itself and to use the bleed nipples. What are these and where would i find them?

Wayne
March 2012

Potterton Potterton Powermax HE Heating, Home Heating Systems Boiler Heating Bleed Radiators

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Potterton Powermax HE: Knocking Boiler - Fixes