I’ve never seen these error codes before, and I’m not sure where to start. Does it sound like a peripheral isn’t responding?
What is your resistance/diode mode readings at the PWM pin at the fan connector?
pin 1 PWM 8.5MOhm/0.523V
pin 2 GND
pin 3 12V
Correct value.
first suddenly it started with infinite blod but with the same error codes