I have gotten the Flame Protection warning several times, I have the Ray 5 10w. I have cleaned the Lense, I have also tried to enter the code $261=0, and i get this response back error:3
Grbl ‘$’ system command was not recognized or supported.
Please helop, I have wasted alot of product
Then the flame detection is deactivated with another command. Search the manufacturers documentation for the correct code.
See if this helps:
The flame protection or alarm 3 is triggered
The flame sensor can be easily triggered. When the flame sensor is triggered, the LightBurn console will display an alarm 3. This may be due to ignition during use, strong light exposure, settings issues, short circuit, or damage. Please refer to the following settings for inspection: Avoid open flames during the engraving process. If an open flame occurs, please reduce the laser power. Place the engraving machine in a normal indoor environment, avoiding direct exposure to strong lights such as flashlights or sunlight. Adjust the flame trigger threshold. First, run the LightBurn or LaserGrbl software, connect the engraving machine to the PC via USB, and enter $42=1300 in the control command panel and press Enter to lower the trigger threshold. If it still triggers, you can continue to reduce the $42 threshold and send it. If the flame sensor is triggered at the start of engraving, it may be due to a short circuit between the sensor’s metal pins and the metal casing. Please manually adjust the position of the flame sensor behind the control box to prevent contact between the metal pins and the casing (the flame sensor is a black cylindrical probe located at the back of the RAY5 control box); if ineffective, you can send the
command $38=0 in the LightBurn or LaserGrbl console to disable the flame sensor function (to 30 enable it again, send the command $38=1)
Here’s lots of good info on your machine
I had a problem with my flame detector going off. Found out when the garage door was open and there was bright afternoon sun shining on the machine it would set off the flame detector. 
No feedback from user. Did any of this help?
As the bluesman almost said: “Great ball of fire!” 