#Help diagnosing main MCU crash (Lost communication with MCU 'mcu') during extruder heating (BTT EBB

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upper orbit
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I'm running into a persistent issue where my main MCU (mcu) crashes with a Lost communication with MCU 'mcu' error the moment I try to heat up my extruder (e.g., during PID_CALIBRATE or SET_HEATER_TEMPERATURE).
Printer: Voron 2.4 (48V AWD )
Mainboard: BTT Manta M8P V2
Toolhead: BTT EBB SB2209 USB
Firmware: Kalico

slow phoenix
upper orbit
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Do I check the heater cable to the toolhead board or the heater itself