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The E.pu error is a general power stage failure.
Typically means that the unit has a defective power stage that would need to be replaced.
If it is an old inverter(early 2000's) there is a possibility that it could be a cooling fan problem since at that time there was a three wire fan used. May be able to replace the fan (must obtain from KEB) but there may still be problems with power stage. If it is from early 2000's then you might be better off replacing the unit with new current version.
Here is an overview of the the items required to communicate with the KEB COMBIVERT F5.
***X4A and X6B connections require special cable from KEB. This is a 24Vdc connection and will damage your PC/inverter if the proper cables are not used.**
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