How to add water (pressurise) a Potterton Combi Boiler central heating E119 error code

How to pressurise a Potterton combination boiler if you're getting an E119 error code. Always seek professional advice if you aren't 100% confident with what you are doing and NEVER open a gas appliance or attempt to service it yourself. If the pressure repeatedly goes down you probably have a leak so you'll need to get the problem looked at by a professional.

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