I have manage to get error diagnosis of FE310,
Description: - The main lift reference switch trips outside the stated range.
Possible cause: - The main lift reference switch does not trip within the stated range. (Compare with the value from the incremental transducer of the height measurement system)
Remedy: - Reset the error display and the controller by switching the key switch off/on.
- Check the reference switch.
- Check wiring.
- Perform a main lift reference run.