Missing error states

[h-tro]

My Vitocrossal 300 CU3A (20CB => VScotHO1) works well with homeassistant-vcontrol. Great work.
However, not all error messages are displayed correctly.
Some error states are unknown. For example, I sometimes get the error "EF" but "EF" is unknown). They are probably not defined in the vcontrold.xml. Is it possible to add the missing errorstates**?**
Here is the link to all codes for the Vitocrossal 300 CU3A:
https://www.manualslib.de/manual/334216/Viessmann-Vitocrossal-300-Typ-Cu3A.html?page=101#manual

Thanks HT