In a discreet announcement, dated 15 July, Senvion said Seyfarth would be leaving the company by "mutual agreement" with immediate effect.
A search for a new COO is underway; CEO Jurgen Geissinger has taken on the responsibities until a successor is appointed.
"We thank Christoph Seyfarth for his contribution and wish him well for the future," said Geissinger.
Senvion would not comment any further.
Former Nordex executive Seyfarth was appointed Senvion's COO in January 2016, and took up the role in February, shortly after Geissinger was named as CEO, following the departure of Andreas Nauen.
Seyfarth was the third new board member for the manufacturer in six months following the takeover of US private equity firm Centerbridge Partners in early 2015.
"I am very much looking forward to working with the experienced management team at Senvion. I am delighted to be given the opportunity to contribute my experience to expanding and developing the company further on its international growth path," Seyfarth said at the time of his appointment.
In the six months since Seyfarth's appointment, Senvion floated on the Frankfurt stock exchange at the second time of asking.
Senvion also launched a 3.4MW turbine for the North American market at AWEA Windpower 2016 in May, declaring its aim to break in to the top five US turbine suppliers.