Descriptions:
The #902 error is usually caused by the environment's Temperature (Room Temperature) being too high. It can also be caused by a cooling system failure, where there is not enough water or the cooling fans are not working. Please follow the steps below to determine what causes the issue.
Possible Causes
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Preparation Items:
Self-preparation :
1| Distilled water
Included in the accessory box:
2| Funnel
3| Double-head wrench
4| Torx screwdriver
Step 0 - Use the checklist while going through the steps:
This checklist will be used to record all your taken actions in this article. After completing the checklist, please print it to save as PDF and send it to your reseller or FLUX Support if necessary.
This will be useful information for us to troubleshoot and narrow down the issue.
Please refer to the link: 5-4 #902 Overheated Checklist (HEXA)
Step 1 - Check the Water Temp. Threshold:
This setting is to stop the machine when the set Temp. is reached. (The default is 34°C.)
(Machine > Hardware Setting > Water Temperature Threshold)
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Step 2 - Check if the water is 80% full:
If your machine doesn't have enough water, this may affect the flow speed to be lower.
- 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:
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Step 2.1 - 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:
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Step 3 - Check the cooling fans:
There are three cooling fans in the machine and they are underneath the screen.
Each one of them has to be working well in order to cool the water. Please see the instructions below to check the fans.
- Turn off the machine. Remove the side casing of the HEXA. ( 8 screws )
- Two USB slots are connected to the Pi board, thus please remove these two cables first.
(Refer to the diagram if your PCB board is not the same as the photo.)
- Turn the machine and enable the cooling fans to see if they are working normally.
Determine your result and the action to take:
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Step 3.1 - Unplug and replug the cable of the cooling fans:
If the cooling fans are not all working, it could be caused by the improper connection of cables.
- Please unplug and replug the cables as instructed below.
- After replugging, enable the fans again to see if they are now working.
(Refer to Step 3)
Determine your result and the action to take:
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Step 3.2 - Reset to Factory
If the fans are not able to be turned on, it could be caused by firmware failure.
In order to exclude the possibility of firmware issues, please reset the machine.
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Reset to Factory. (Machine > Reset to Factory)
- After the reset, enable the fans again to see if they are now working.
(Refer to Step 3)
Determine your result and the action to take:
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Step 3.3 - Mainboard test:
We are going to check if the mainboard's slots for the fans are all working well.
- Find the working fan's cable by unplugging the cable one by one.
- Test each slot on the mainboard.
Determine your result and the action to take:
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Step 3.4 - Cooling fans test:
We are going to check all cooling fans are working well by plugging them into a working slot.
- Unplug all the cables of the fans and find a working slot.
(Refer to the diagram if your PCB board is not the same as the video.)
- Once the slot is found, plug the cable of the fans one by one to test out if the fans are working.
Determine your result and the action to take:
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Step 4 - Cool down the machine to 27°C or below:
- Try to cool down the machine to 27°C by turning off the machine, turning on the air conditioner, fans,...etc.
- Make sure your room Temp. is lower than 27°C.
- After the step above, check the Temp. on the panel.
Determine your result and the action to take:
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Step 4.1 - Run the task where the error pops up:
- Directly run the same task using the same parameters and settings...etc.
Determine your result and the action to take:
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Step 5 - Unplug the flow sensor and check the Temp:
This step is to check if the mainboard is having an issue reading the Temp. Usually, when the flow sensor is removed from the system, the Temp. reading should be around 260-290°C.
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Unplug the cable of the flow sensor at the back of the machine.
(The square plate has to be removed first.)
(Refer to the diagram if your PCB board is not the same as the video.)
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Go to Maintain and check the Temp.
Determine your result and the action to take:
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Step 5.1 - Repulg the flow sensor and try to cool down the machine:
This step is to check if the issue was caused by the improper connection of the flow sensor.
- Replug the cable of the flow sensor. (Refer to Step 5)
(Refer to the diagram if your PCB board is not the same as the photo below.)
- After replugging, try to cool down the machine to 27°C or below.
Make sure your room Temp. is below 27°C.
Determine your result and the action to take:
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Step 5.2 - Run the task where the error pops up:
- Directly run the same task using the same parameters and settings...etc.
Determine your result and the action to take:
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Step 6 - Reflash SD card:
Sometimes, the error can be led by corrupted firmware that wasn't installed correctly or was damaged. Taking this action can exclude the possibility of firmware issues.
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Please refer to the instructions in the link below to reflash your SD card.
[5-24 HEXA - Reflashing SD Card]
- Go to Step 6.1 after reflashing.
Step 6.1 - Cool down the machine and run the same task:
- After replugging, try to cool down the machine to 27°C or below.
Make sure your room Temp. is below 27°C.
- Directly run the same task using the same parameters and settings...etc.
Determine your result and the action to take:
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Step 7 - 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]
- Make sure you've completed the checklist and saved it as a PDF file so you can share your taken actions.
*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
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