Check the layout information
Loop labels, manifold access and drawings help distinguish an expected pattern from an area worth investigating.
Consider several explanations
Operation, controls, floor finishes and circulation can affect temperature. A cold patch is not by itself evidence of escaping water.
Use appropriate circuit checks
Where pipe leakage remains suspect, suitable isolation and testing can focus further detection.
Explore the relevant service
General information for planning an investigation. The property, instruction and findings determine the appropriate work.