The Flow Detect notebook
A cold patch on underfloor heating
Why comfort and water loss are different questions.
A cool area has several explanations
Controls, balancing and flow can affect floor temperature. A cold patch alone does not prove a damaged loop.
Look at the system history
Pressure loss, recent work and any previous loop tests help decide whether a water leak investigation is appropriate.
Make the manifold available
Loop labels and drawings may support suitable isolation and tracing. The operating conditions for useful thermal checks should be agreed in advance.
Put the information into context
This guide explains common investigation principles. Your property, the available access and the actual test findings determine the right next step. It is not a diagnosis of an unseen system.