ID #1574 FCC/S 1.x.2.1: Why does the LED of an input on the membrane keyboard flash? Marcel Feuerstein 05.07.2018 12:02 0 Comments This could be an invalid measured value. For more information please have a look into the product manual. In this case the sensor, the cables and the settings in the ETS have to be checked. Tags: ClimaECO, HVAC, KNX