#900 Low Coolant Flow/Cooler Off/Cooling system failure

Step 1 - Check if the water is 80% full:

• Open the water pump cover with the Torx screwdriver and check if the water is 80% full.

• Check if there is any leakage on the pump.

Determine your result and the next action to take:

Step 1.1 - Fill up the water:

• Please refer to the video in the link below to add more water to the pump.
  Cooling Water Replacement
  
  
   
• After filling up the water, please check if the problem is solved by running a random task.
  

Determine your result and the next action to take:

Step 2 - Check if the water is clean:

Dirty water will affect the flow of the water. Make sure to have clean water in the system.

Determine your result and the next action to take:

Step 2.1 - Change water:

• Please refer to the video in the link below to change the water.
  Cooling Water Replacement
  
  
   
• After changing the water, please check if the problem is solved by running a random task.
  

Determine your result and the next action to take:

Step 3 - Test the flow speed:

Please perform a flow speed test and see if the value is normal.
(Machine Panel > Machine > Hardware Settings > Flow Speed Test )

Determine your result and the action to take:

Step 4 - Check the water hoses:

If you have a bad value that is bigger than 0L/min and smaller than 3L/min, this indicates your whole system works okay, but the flow speed is too low and this might be caused by water hoses being bent or kinked.

• Bent hose: (Bad example)
  

There are three locations to check for water hoses.
(If your hoses are bent or kinked, please try to adjust their positions.)

• Location #1 - Water pump: 
  
   
• Location #2 - Radiator & Cooling fans: 
  
  
  
  
  
   
• Location #3 - Laser tube: 
  (The back cover has to be opened first.)
  
  
  
   

Determine your result and the next action to take:

Step 5 - Check if the water pump can be activated.

Please refer to the video below for how to perform the test.
If a water pump is activated successfully, the water inside the tank will be pumped, and you should feel it vibrating when touching it.

• How to check:
  (Machine panel > Control > Pump > Check the pump at the back)

Determine your result and the next action to take:

Step 5.1 - Try to exit the protective mode of the pump

If the water level is not high enough while the water pump is running, it will enter protective mode, meaning it will not be able to run.

• To exit this mode, turn off and remove the power cord. Wait at least 1 minute.
  
   

• After 1 minute, turn on the machine to test if the water pump can be activated.
  (Machine panel > Control > Pump > Check the pump at the back)

Determine your result and the next action to take:

Step 6 - Try to activate the water pump physically:

Please take the following actions to try to activate the water pump.

• Unplug and replug the water pump's cable.
  (Refer to the diagram if your PCB board is not the same as the photo.)
  

• Enable the pump on the Maintain page first and pinch both hoses at the pump's inlet and outlet to apply pressure with your fingers.
  (It could be the stuck air in the system that the pump is not able to push.)
  
   
• Enable the pump on the Control page first and hit it with your hand.
  (It could be the pump's turbine being stuck, causing the pump not to pump water.)
  

Determine your result and the next action to take:

Step 7 - Replug the cable of the flow sensor:

A bad flow speed may be affected by improper connection of the flow sensor.

• Replug the flow sensor's cable on the plotter board at the back of the machine.
  (Refer to the diagram if your PCB board is not the same as the photo.)
  
   
• Once you've replugged, please run a flow speed test and see how it goes.
  (Refer to Step 3)
   

Determine your result and the next action to take:

Step 8 - Reset to the Factory:

Please reset the machine to the factory and run a flow speed test.
(The purpose is to see if this is firmware issue related or hardware issue related.)

• Reset the machine to the factory.
  (Main Page > Machine > Next page > Reset to Factory > Yes)
  
   
• After the reset, run a flow speed test again.
  (Refer to Step 3)

Determine your result and the next action to take:

Step 9 - Report to the local reseller or FLUX Support:

• Please follow the instructions in the link below to properly report an issue to your local reseller or FLUX support. [Contact Customer Service]

*The collected information such as photos or videos that show the problem of your machine in this article will be necessary to be shared with the reseller or FLUX Support.

#END