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Hi I have a Solfex UFH system installed by my builder but without any great knowledge (used Solfex design service..) It has three zones, one of which has two loops controlled by the same thermostat and actuators on the return manifold for control. Although the Solfex design defines the flow rate for each loop every flow meter seems to say there is zero flow in every circuit (the top of the 'float' being at the top of the gauge at zero) However the rooms are warm so something is happening! I have tried to adjust the flow by turning the flow meters but from fully clockwise to unscrewed from the manifold (very wet!) there is no change in the indication. The Solfex instruction are poor (just says lift the locking ring and twist the indicator base) and little info on line.. I witnessed the flushing/priming and pressure test of each circuit so I don't believe there is a blockage.. What am I doing wrong!?