| This command may block the command queue. Enable `EMERGENCY_PARSER` so that hosts can break in using [`M108`](/docs/gcode/M108.html). |
| Use [`M143`](/docs/gcode/M143.html) to set the cooler temperature and proceed without waiting. |
| Configuration settings. |
| `COOLER_MINTEMP` Provides a low end safe operating temperature, cannot be lower than 1°C. CO2 lasers tubes can be damaged with values less than 15°C. |
| `COOLER_MAXTEMP` Provides a high end safe operating temperature, when breached the system will shutdown if `THERMAL_PROTECTION_COOLER` is defined. CO2 laser tube life degrades exponentially at temperatures above 24°C. |
| `COOLER_DEFAULT_TEMP` LCD menu default value is 16°C. |
| `TEMP_COOLER_HYSTERESIS` The accepatble temperature variance + or - to the target. |
| `COOLER_PIN` Cooler on/off pin used to control power to the cooling element. |
| `COOLER_INVERTING` Inverts the on value to 0. |
| `TEMP_COOLER_PIN` Laser/Cooler temperature sensor pin. |
| `COOLER_FAN` Enables a fan on the cooler. |
| `COOLER_FAN_INDEX` Defines which fan to use 0,1,2 etc. |
| `COOLER_FAN_BASE` Base cooler fan PWM (0-255); on when the cooler is enabled. |
| `COOLER_FAN_FACTOR` PWM increase per °C above target. |
| `THERMAL_PROTECTION_COOLER` Enables thermal shutdown protection. |
| `THERMAL_PROTECTION_COOLER_PERIOD` Thermal protection check interval in seconds. |
| `THERMAL_PROTECTION_COOLER_HYSTERESIS` Thermal variance +- limits check interval. |
| `WATCH_COOLER_TEMP_PERIOD` Check interval in seconds before runaway condition shutdown. |
| `WATCH_COOLER_TEMP_INCREASE` Allowable increase during check interval. |
