Rotameters Not Responding: Underfloor Heating System (Vaillant EcoTEC Boiler) Flow Regulation Issue

The discussion revolves around a Vaillant EcoTEC boiler's underfloor heating system, where the rotameters are unresponsive, indicating maximum flow despite attempts to adjust them. The user reports that the installation was vented and has minimal usage, raising concerns about potential blockages or impurities affecting the rotameters. Various suggestions are made, including checking the condition of filters, ensuring the pump is operational, and verifying the installation's flushing before commissioning. Ultimately, it is revealed that the boiler was not functioning correctly due to external temperature conditions, which led to the rotameters not registering any flow. Adjusting the set temperature allowed the boiler to operate properly, restoring flow readings in the rotameters.
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