Hello, I’m living in a new build, approx 6 years old, with underfloor heating. Up to about a month ago everything was working well, and the house was toasty.
Over the last month, the downstairs floors are failing to heat up. When I look at the manifold, there is hot water at 50 degrees coming from the boiler, but all the return flows for all circuits are cold. All of the circuits are calling for heat and never get up to temperature. I got a plumber out, he replaced the pump on th manifold, that has made no difference at all. Next I flushed all of the circuits to remove any air, again this has made no difference. As a final test, I have closed all but one circuit and am waiting to see if that heats up. Failing that I am at a loss as to what the problem could be and am looking for some advice.
regards,
matthew