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Central Heating Flow Not Getting Past Non-Return Valve

Central Heating Flow Not Getting Past Non-Return Valve

Central Heating Flow Not Getting Past Non-Return Valve

Hi All,

So, I am currently having an issue with my central heating provided by my combi-boiler.

Every time the central heating is called and the central heating pump turns on, the flow can't get passed the 22mm double non-return valve (labelled by red arrow in attached photo - "Top of Boiler (Labelled)"). I know this because the pipe is cold downstream of the non-return valve (labelled as yellow in same photo) and hot upstream. The green arrow in the photo indicates direction of flow.

To...

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by Glennington

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