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Have you checked your remote control if you have accidentally set the timer off to turn off one hour after turning it on?Seems like the problem because the timer LED is lighting up means that the unit has shut off via the timer.Verify the remote if there is a timer setting on it. If you would not recognize it, try to remove the battery for about 5 minutes, return the battery, then just press the on and off switch and put it in cooling mode and observe if it did correct the problem.
no it isn't the timer problem, when the timer blink the air-cond not shut off itself, there still had hot air blowing out from it.
Try to count the number of blinks if there is a pause . If there is no pause, just a continuous blink, then it is not an error code but simply an indication that it is on timer mode that is why it turned off the compressor.If really there is no setting on the remote regarding timer setting and the blinks are not error codes, then I can say you need a new pc board.
The sensors are different. The one inside the copper tube is held by a small stainless clip. You will need to pull the stainless clip first before the sensor would come out of the copper pipe easily.Be careful pulling the other end of the wire, the one in the pc board, sometimes, the socket on the board comes off with the wire and you would need to re solder them it it happens.