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With the silicone coated circuit board in place, the little LEDs light when power is coming through.
If you hear a click while adequate pressure is applied to the pressure port, flow should change.
If you are using your lungs to provide the pressure, it won't work - pressure too low
If your robot system is providing pressure, and you are checking operation with no load connected to the valve ports, the pressure you can get is still too low.
Without cylinders attatched, use some kind of flow control - either the grey flow control valves on the end of some tubing (not in the ports of the FESTO), or just kink the tubing in a 180 degree bend. then operate the FESTO valve, and see if the air goes the other way, by slowly releasing the tubing.
If it doesn't, contact FESTO.
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