I also had this exact same error. After checking the situation, the used M54F/M54F Adapter from my Pegasus Falcon rotator which has thread of 6mm was too long and went into the EFW housing. This prevents the filter wheel mechanically to change the position. Especially the my baader filter and its M48-ring blocks the motion. This was the reason for the error.

A 2mm M54 distance ring solved the problem (3D printed). The EFW housing thread is 4mm deep.

I had no problems any more after that "fix" with error messages.

Cheers Axel

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