---
tag: m0193
title: Wait For Laser Cooler Temperature
brief: Set and wait for a new target laser coolant temperature
author: descipher

group: thermal
since: 2.0.8

codes: [ M193 ]
related: [ M143 ]

requires: TEMP_SENSOR_COOLER, TEMP_COOLER_PIN, COOLER_PIN, LASER_FEATURE

notes:
- 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.'

parameters:

- tag: S
  optional: true
  description: 'Target laser coolant temperature.'
  values:
  - tag: temp
    type: float

example:
- pre: Set laser coolant target temperature to 15°C and wait until it's reached.
  code: M193 S15

---

`M193` optionally sets the cooler target temperature and dwells until the cooler temperature is equal to or below the target.
Values will be limited by the `COOLER_MAXTEMP` setting (See `Configuration_adv.h`).
Use [`M143`](/docs/gcode/M143.html) if you want to set the target temperature without waiting or to turn the cooler off.
