ECU rebuilds 355

Do you mean the HVAC ECU, Ferrari part number 64324800?

Do you have a specific problem with the heating system? There are a few DIY threads on the F348/F355 sub-forum relating to these units. Some involve replacing cheap integrated circuits. In other cases, external components are causing the ECU circuit chips to blow up. It's important to make sure the valves and things are operating normally before replacing/repairing these expensive units.

 

I used Scientific Auto Inc. to rebuild my HVAC ECU in the spring of 2016. Three years later, still working perfectly. I paid for the lifetime warranty since the six main chips that control the actuators, hot water pump, heater valve, etc. are prone to failure over and over again.