Temperature of filament chamber is over threshold value (85℃)
a. Re-plug J14 in filament I/O board, check if there are damages or broken in the cable.
b. Unplug J14 in filament I/O board, and measure the resistance, it should be around 100KΩ @ 25°C indoor temperature. If it is 5KΩ , it equals to 85°C. Replace the sensor as needed.
c. If resistance of sensor is normal,replace the I/O board.