Found this info here under Problems/Ferrari;
https://www.systemsc.com/problems.htm
Valeo Clutch ECU - The Mondial T ('93) Valeo clutch ECU (150393) can be problematic if the battery
is jumped, or if a battery charger is used with the ignition key "on" or to start the car. The typical failure
mode is the inability to disengage the clutch via the clutch actuator, not allowing the engine to start.
The ECU may also fail to engage the clutch. The ECU uses a potentiometer to provide the feedback
position of the clutch actuator in the clutch actuation process. Powering the clutch actuator directly
when troubleshooting should always be done with the ECU disconnected or the ECU will be damaged.