The line might be twisted around the spool.
Watch the short videos below or follow this step by step guide in order to replace and properly wind the line in the spool.
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Cut a line of 5,2m trimmer line (2,0mm).
Align the two arrow marks on the trimmer head by turning the centre knob.
Push the line thru the trimmer head according to the picture. Make sure both ends are of equal length.
Wind the trimmer line into the spool by turning the centre knob in the direction of the arrows while holding the trimmer head housing still. Turn the knob until the line ends stick out about 130mm out from each side of the trimmer head.
Feed out trimmer line by bumping the centre knob to the ground while the trimmer head is rotating.