Chamber Mintemp error #31215 (CORE One) #35215 (CORE One L)

What happened?

Your printer is showing the message "Check the chamber thermistor wiring for possible damage."

Error name: Chamber mintemp

Error Number: #31215 (CORE One) #35215 (CORE One L)

This error happens when the temperature measured by the chamber thermistor has dropped suddenly.

How to fix it?

This error is usually caused by the chamber thermistor. It is located on the fan grid on the back panel of the printer. Check if the thermistor is in place and if there is no damage along the cable length. Move the cable by hand and check if the temperature fluctuates over 5ºC at a time.

Access the xBuddy and xBuddy extension boards and check the thermistor cable connector. If the thermistor is damaged, it needs to be replaced.

How to access electronics - CORE One

Locate the xBuddy board case. Looking at the printer from its rear, it is the rightmost case.

Using a T10 Torx key, remove six M3x4bT bolts to release the xBuddy box cover.

The bottom larger board is the xBuddy board, while the top smaller board is the xBuddy extension board.

How to access electronics - CORE One L

Locate the Wi-Fi module on the rear panel of the printer. Using a 2.5 mm Allen key, remove the M3x14 screw. Gently pull the Wi-Fi module straight downward to remove it from the printer.

Note that the Wi-Fi module is connected to the electronics with eight spikes.

From the inside of the printer, locate on the rear side the highlighted M3x4bT bolts.

Using a T10 Torx key, remove two M3x4rT bolts to release the rear xBuddy box cover. Lift the cover to expose the xBuddy and xBuddy extension boards.