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Main LED flashing Red and Yellow?

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Well the yellow is kind of yellow/green.

Here's a video of the sequence:


I've never seen this sequence before and it doesn't seem to be covered in the manual. I had just recalibrated the compass and the gimbal. The drone flew without any problems but I'd like to know what it means. The Main LED showed the proper colors for Smart Mode and Return to Home but kept flashing Red/Yellow in Angle Mode. The drone had 20 satellites locked when this occurred.
 
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After you rebooted the H did the colors stay the same?
Yes. Both the drone and the ST16 have been rebooted several times. The compass recalibration was done in the morning. The drone flew safely, was shut down and restarted about an hour before sunset and it was still flashing Red/Yellow. It flew safely again and was shut down for the day.
 
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The status LED is flashing red/yellow because it's trying to flash purple/white and the blue LED isn't working.

RG
I was able to get it to flash purple/white today but it then changes to red/yellow. Can the blue LED be intermittent?
 
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DoomMeister

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I was able to get it to flash purple/white today but it then changes to red/yellow. Can the blue LED be intermittent?
More likely is the wiring or a cold solder joint causing the issue. I believe @WTFDproject had the same issue a couple of years ago. The easy way to test for the blue is to power up the aircraft without the ST16 being on. You should get flashing blue since the TH and controller are not bound at that point.

The easiest point to check is the connector at the Mainboard. Unplug/plug it three or four times and see if proper operation is restored. If not check continuity from the connector to the Main LED circuit board.
 
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