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why do I have to pressurising my boiler?

I have to keep pressurising my potterton promax combi 28 he plus, Can anyone help?

January 2017
The reason for constant repressuring, 1,loosing water ie leaking radiator,or 2,faulty pressure relief valve,or more likely 3, faulty expansion vesell. water will be dripping from the outside pipe in the latter 2 situations.

Name ron homer, heating engineer. wolverhampton
February 2017

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