I have 3x multiplus 24/3000 connected in a master/slave config with VE-bus. Making 3-phase 400V. Out of 1 phase or 24V battery. Worked fine for years. Now I get error codes when switching from mains to battery: E4, E3, E1. Quite random. And obviously system fails
One (I think slave) unit makes a lot of rattling noise. Or sometimes a somewhat slower tick, tick tick (half a second interval)
Cleaning UTP connections or even replacing them helped me in the past, but not this time.
Is this a dead machine or is this fixable?
And if not fixable, can I replace 1 machine? Are 12-15 years old..