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My underfloor heating isn't working since this work was done (boiler kettling). Do you think the pump being the wrong way would explain that? The UFH has it's own pump so I'm wondering if the two pumps are pumping against each other and reducing the flow through the boiler-hence the kettling.

I have a central heating pump that looks like it's fitted on the return. The pump isolating valves were replaced recently and now I'm worried that the pump has been put back the wrong way round. If the pump is fitted on the return, should the arrows be pointing towards the boiler? They are...