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high pressure

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a friend has a vokera mynute 20e back boiler. when filled up to a bar the pressure rises to 3 bar and blows off, any suggestions?
 
a friend has a vokera mynute 20e back boiler. when filled up to a bar the pressure rises to 3 bar and blows off, any suggestions?

Expansion vessel?

Why does your friend not post the question himself?

Tony
 
It's not a back boiler, it's a combi boiler. If you want to fill it to 1 bar, stop filling it when you get to 1 bar. If you continue filling the pressure will continue rising. If the pressure rises to 3 bar very quickly then you probably have an expansion vessel problem (see FAQs).
 

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