A bit of in depth research on the Sunvic site suggests, that the positioning of the D on the valve is not the same between the two actuator models, for all three valve positions. Swap the model and the valve also has to be swapped to match it. The 1901 seems to do a full
360 deg rotation to find its correct position, the 2701 only around a
150 deg partial rotation.
The thing now is - Is the later 1901 any more reliable than the 2701? The 1901 seems to have design and component spec. issues, but they can be more easily DIY fixed/ upgraded. I am also fed up of repairing the spring return 2701 versions.
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