If an underfloor heating system is not warming up a room, you should check the following:
That the room thermostat fitted is calling for heat and that the valve has opened using the visual window on the actuator.
That the room thermostat is connected to and communicating to the correct actuator(s).
That the room thermostats are not operating in temperature set-back mode.
That the flow temperature is correct as it enters the floor loops. Although typical design water temperatures are suggested throughout this guide, there is some element of a learning curve with UFH, as on some occasions the design water temperature may need to be raised after commissioning and once the system has been in operation during a heating season.
That the primary flow and return connections are installed correctly and not crossed over at the UFH manifold.
That the primary water temperature is not too low. This needs to be at least 10˚C higher than the UFH system water temperature, especially when using a mixing valve / pump kit.
Thermal resistance of floor covering is not too high, as this could reduce the floor heat output.
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