There are many reasons why underfloor heating may not be warming up properly; the most common causes are air locks and sludge buildup in the pipes. Here's how Master Xiao Yijiang recommends troubleshooting and resolving the issue: Step 1: Check the Manifold - Ensure both supply and return valves are fully open - Feel the temperature difference between the supply and return pipes - If the supply pipe is hot but the return is cold, circulation is likely restricted Step 2: Bleed the System - Close the main return valve - Open each zone's bleed valve to release trapped air - Continue until a steady stream of water flows out - Close the bleed valves and reopen the main return valve Step 3: Clean the Pipes - After 2–3 years of use, mineral deposits and biofilm can accumulate inside the pipes - Professional cleaning with a pulse flushing machine is recommended - Proper cleaning can raise water temperature by 3–5°C Step 4: Inspect the Filter - The Y-type filter at the inlet of the manifold often gets clogged with debris - Remove the filter screen, clean it thoroughly, and reinstall Xiao Yijiang offers comprehensive underfloor heating services including cleaning, repairs, and upgrades. Our professional equipment delivers visible results. Book before winter for special discounts—call us at 400-1060-908.
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