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They are all open. But obviously they don’t measure in reverse flow so the system can never have been balanced.

Will do. I meant the concrete slab as the heating has been off or two weeks it is very cold. So the return side is still barely warm.

The fault was found to be the valve which wasn’t opening sufficiently. That has been replaced. The slab is cold and the bottom manifold is warm. The top is slowly warming as I assume heat loss in the cold slab is cooling the water. The flow meters have never shown anything.

thanks. Yes, it seems that would be why you have a temp gauge on the top left (presumably should be top right) to measure the flow temp. It appears to cause the flow meters not to work. But beyond that is it likely to cause any other issue?

Yes there is a blending valve and pump on the Mitsubishi air source system. Will send picture shortly.

Hi. So we had a problem with the pump on the boiler feeding our underfloor heating system. As a result I had the chance to have a careful look at the manifold and I’m concerned that it was actually plumbed up incorrectly. Now it has been running for a couple of years and broadly working but I am...