Eheim 2227 Filter with Float Valve problem

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Has anyone else experienced this problem:

My Eheim filter is stuck on full blast, it no longer fills and drains,
fills and drains...it now is permanantely full and it keeps pumping.

The float valve is stuck in the up position, it no longer sinks. Can
anyone suggest what might be going wrong with it?

I have taken it apart and made sure all seals are good, and it is all
clean inside.

Any help appreciated.