I enabled temp monitoring both for manta mcu and rp2040. Also I added gpio26 to the “GPIO pins to set at micro-controller startup” on ebb firmware (this is a red led on ebb board). Then I added output pin EBBCan:gpio26 to klipper config with initial value = 0. So when ebb board resets red status led lights and then it turned off by klipper.
Test print failed on second layer and red light appeared (at same time when fan stop noizing). And ebb mcu temperature at this moment was 35C (chamber: temp=27.0 EBB_NTC: temp=37.3 EBB: temp=35.0 MCU: temp=42.8 CB1: temp=40.9 sysload=0.06 cputime=185.621 memavail=659468 print_time=1611.347 buffer_time=2.338 print_stal
l=0 extruder: target=235 temp=234.9 pwm=0.151)
So yes - reset of ebb2209 is the reason of failure. Not sure if it hardware or software fail and don’t know how to debug this. I’ll try to replace ebb…