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Check your line contactor for welded tips: Manual states.....

In case of alarm follow this procedure:
1. Verify the correctness of wiring from pump
motor and relative inverter;
2. Replace cable connecting the output CN4 of the
logic with the corresponding inverter;
3. Replace the inverter connected to CN4 output
of the logic;
4. Verify if main breaker has stuck closed
terminals: in such a case replace it;
5. Replace the cable connecting the output CN1 of
the logic to the right drive motor inverter: a
defective cable could give a wrong measure for
capacitors voltage;
6. Replace the right drive inverter;
7. Replace logic.