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Knocking or hammering at the compressor is indicative of liquid refrigerant in the compressor. The compressor can't compress liquid. You'll need to call someone out to possibly evacuate and recharge the unit to remove the liquid in the compressor
I'm not sure if NewAir is made by Gree -- they supply many. On Gree units, E7 simply means one unit is requesting heating while another is requesting cooling and you can't have both at the same time. So that's the first thing to check. Very simple, very common, doesn't indicate that anything is wrong with the system.
From what I could find it means that the indoor unit has a malfunction on the liquid gas line pipe thermistor.
You should refer this terror code to a trained and qualified technician to further investigate the fault for you.
Is the compressor starting? On the outdoor unit you will see a large copper pipe and a small copper pipe. Is the larger of the two cold to the touch? wet? Just because a central air system is not blowing cool air does not mean it needs freon. If you have clogged filters it cannot do an air exchange. So, I would recommend checking the easiest things first before adding Freon.Most people make the mistake of adding Freon and overcharge their system. In a low load situation you can slug the compressor with liquid and your system is ruined. If you do have to add Freon it indicates that you have a leak. An AC System is a closed system and if it is working properly you should not have to add Freon.
Yes, it's an excellent idea to remove front of the unit and clean it. Clean the filter too, while you're at it. You can use a vacuum that has a hose and brush attachment to clean the front. If it's really diety use warm water and mild dish washing liquid to wipe the front and back of the front off. Rinse and dry thoroughly. The "roller" thing, is a squirrel cage blower. You can vacuum that, too. But, before you do anything ... Turn the unit OFF and unplug it.
To remove the front, do it the same way you do, when you take the filter out for cleaning.
Hope this helped you and thanks for choosing FixYa.
TOYO mini split air conditioner made in Japan is very very good quality and it can runs for 20 years without any problem. E3 means low pressure of refrigerant. You didn't hire a best ac technician to install your TOYO unit. The tubing connection between indoor unit and outdoor unit is not the right torque and refrigerant leak. Your TOYO unit runs out of refrigerant. You need fix the leak and fully charge the system. You will solve the problem. Good luck to you!
When 13+ SEER condensers are replaced without installing a inside coil with an expansion valve the compressor in the new unit will slug and go bad. Slug means that liquid refrigerant returns to the compressor. Liquid can not be compressed so it causes the compressor to fail.