¶ E309 - Chamber T Sensor wire is broken
¶ This error happens when the T sensor or its cable has issues.
¶ Steps:
(1) Use knob wrench to remove the back cover of printer, locate the plug J9 near left lower corner of mainboard (temp sensor of printing chamber , Figure - 1), unplug it.
(2) Measure the resistance of temp sensor via the 2 pins of J9 (Figure - 2). Normally, the resistance value should be around 110kΩ@25°C ( the value in Figure - 2 is 91.1kΩ because of the indoor temp, it's a normal value ). If the resistance value had a very big difference, please replace the temp sensor. (Step of replacement)
(3) If the issue persist, please replace the main board. (step of replacement)