Greetings, I am a refrigeration technician I have a problem with a mini split card, which turns on and after a short time the car green light is blinking, this equipment has two cards one in the console and one in the external unit The same is communicated by a cable marked (S) the communication is correct, the card of the external unit apparently works well has a red LED is always on, first internal card fails then begins to flash the external one, check the sensors are inside the 10 Ω range, the internal blower is 3 speed controlled by relays, I appreciate your help to solve this fault I leave a video and in advance thank you very much falla_x264.mp4 [1.32MB]

Check that the connectors of both sensors do not have cold solder on the card, then you measure that in each one these connectors are reaching 5VDC, if you keep these 5VDC in mind, reconnect the sensors and in each one there should be about 2.5VDC. .. If the fan has individual relays for the speeds then surely it has no Hall sensor but individual speed coils in the motor. Do this preliminary tests, rewrite what you have achieved