Re: smeg dishwasher di 612 c e4 fault
I’m afraid your deduction is incorrect. An error code would be displayed by LED 5 showing steady and a combination of LEDs 1, 2 + 3 flashing.
The start/stop/start/stop you are describing sounds like a classic corruption issue which can be caused by the release solenoid on the dispenser or the pcb itself. I’m afraid it’s impossible to be more exact than that.
There is an article worth reading HERE.
Penguin45.