This has a new fangled direct drive motor. Normally the fix would be to replace the motor controller or one of the capacitors on the board, but this has none of those, and appears to be run by one control board and that is no longer available. Try cleaning the connectors to the control board with electrical switch cleaner spray. Your best bet is to call for service and hope they can replace the part that is preventing the spin cycle.
https://www.searspartsdirect.com/model/1nx1gwawbm-003204/lg-wm2688hwm-washer-parts
Some videos on that issue
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As LG states in troubleshooting section,
If your unit is displaying a "PF" error code, it means you've experienced a power failure. This may occur if the power supply to the washing machine is interrupted during a cycle from a power outage. To fix this, simply restart the washing cycle
LG Washer - Error Code List ' LG USA Support
JustAnswerhttps://www.justanswer.com > Appliance Repair
Dec 12, 2020 - Unplugging the washer will reset the issue one cycle at a time, but to fix the issue completely the main board will need to be replaced. This is ...
1 answer ยท Top answer: This is a very common way for front load LG washers to fail. The problem is that the main ...
This is a 'front end loader'.
https://www.google.com/search?q=front+end+loader
Google
LG (model number) light flashing
No idea what you mean by
drying light flashing in the cooling light to stainless
and I have been reading the question since yesterday!
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Wrong washing deterjant being used and machine not leval . Google your machine with the error code and you find a u tube link on this that will help you
You can't they are sealed. You just replace them. The sealed bearing units are shown here. Change them yourself and save a callout and an hour and a half labour.https://www.google.com/search?q=LG+TROMM+bearings