Red blinking and ac not working

This problem is outdoor unit issue. Blinking 4 times in carrier highwall unit means Compressor drive malfunction. Possible cause are the following:- Stuck up or grounded compressor.- Magnetic contractor in outdoor unit is defective or indoor unit relay supplying outdoor unit is defective.- No power supply going to outdoor unit

On that particular model you need to press the power button nine additional times waiting for the light to Blink 9 times each and then after the 9th time the procedure is as follows... Press the button 4 times hold for seconds on the fifth button push then release for 4 seconds then press the button twice and it should blink 8 times repeat this procedure continuously until the button only lights up once. After the button lights only once then you are ready to place the item into a garbage bag and throw it into the dump

possibly the filter...

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

The outside unit has a problem. Have it tested.

How many times does the red light come on ? It should blink a number of times, then go off for a little while, and start blinking again. The number of blinks within each cycle will help you find out what is wrong:
Number of 1-second red LED blinks followed by 2-second pause, then repeats:
2-processor thermal protection activated
3-processor not installed
4-power supply failure
5-memory error
6-video error
7-PCA failure (ROM detected failure prior to video)
8-invalid ROM, bootblock recover mode
(http://h18000.www1.hp.com/products/quickspecs/productbulletin.html#spectype=worldwide&type=html&docid=11632)

relay must be change,
or the indoor unit board to be change

Did you figure out why the ac wasn't responding to the remote? I am having the same problem. I just cleaned out the filters but it's still not responding to the remote. I have already tried reset button in the remote, which didn't help. I am pretty sure that the remote is not out of battery.

I was told the same thing that Dennis has posted by the guy who came to service the AC. So I think, it is ok as long as it blinks 9 times in a row and then repeats it after a brief pause.

It's dead. 9 Blinks means the display adaptor is dead. If it's still under warranty, you're covered.

Replace the G board ( where the power cord plugs into)