Discuss Wilo Yonos Pico pump - gurgling sound in the Central Heating Forum area at PlumbersForums.net
If you have a open vented system ensure header tank "full", if a closed system with expansion vessel ensure system pressure at 0.75 to 1.0 bar which I'm sure you have.
Can you try and vent the pump with the discharge valve closed and then try and vent it through the 1.5 ins connection to the pump body discharge, that should ensure that you have a flooded pump then suggest constant pressure mode at 3m setting. With a closed discharge and pump properly flooded/vented the power should be ~ 12W and should increase on opening the discharge valve.
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