# 3D printing module won't heat up The known reasons for the heating problem are: ### 1) The Temperature Sensor connection is unstable or the Sensor is short-circuited. Please visit our troubleshooting tutorial to fix it {% embed url="" %} Or follow the instructions below to repair it: If the plastic cover is broken or the wire touches the metal part, the sensor can't read the temperature. You can check it out by sending **`M105`**in Terminal, with this issue, you should see a minus temperature value(usually -15 ℃) or see a MINTEMP message shown as the picture above.

To fix this: #### A. Unscrew two hex screws with an Allen wrench.

#### B. Unscrew the temperature sensor.

#### C. Make sure the cover is complete and then screw on the temperature sensor.

#### D. Connect with Rotrics Studio and send `M109 S190` to test the heating.

### 2) The heat stick wire is disconnected.

Temperature couldn't reach the target temperature after a few minutes. To fix this: #### A. Unscrew two hex screws with an Allen wrench.

#### B. Split the heat stick connection cover.

#### C. Solder the wires together and put on the covers. #### D. Connect with Rotrics Studio and send`M109 S190`to test the heating.

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