My Lg washer is showing a code UE and then PF what can I do to fix this problem.

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

Question edited for clarity

An LG washer displaying the UE or uE error code means that the load in the washer is unbalanced. ... When the uE error code is displayed, it means that the washer is trying to resolve the issue. The washer will fill with water to try to balance the load. It will then drain and try to spin again.
Jun 7, 2021

How to Fix the LG Washer UE Error Code - Fleet Appliance

https://fleetappliance.com > News and Tips

IE ERROR, INLET VALVE ERROR

OE ERROR, DRAIN ERROR

FE ERROR, OVER FLOW ERROR

PE ERROR, PRESSURE SENSOR ERROR

dE ERROR, DOOR OPEN ERROR

tE ERROR, HEATING ERROR

LE ERROR, LOCKED MOTOR ERROR

bE ball sensor error code

EE defective EEPROM

bs2--vibration sensor check

INLET VALVE ERROR

DRAIN ERROR

CL Flashing, Child Lock

PF Error, Power Failure

CE Error: Communication Error

UE Error: Imbalance Error

IE: Water level
UE: Imbalance
OE: Drain problem
FE: Overflow
PE: pressure sensor
dE: door error
LE (with a a slash in the
middle of L. Thermister out
CE: Over amping
LE: hall sensor short
bE: Ball sensor loose connection
EE: eeprom out
PF: power failure
Service manuals for LG front loaders

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

LG Error quick list. Print it and post it near the washer:
IE: Water level
UE: Imbalance
OE: Drain problem
FE: Overflow
PE: pressure sensor
dE: door error
LE (with a a slash in the
middle of L. Thermister out
CE: Over amping
LE: hall sensor short
bE: Ball sensor loose connection
EE: eeprom out
PF: power failure

My Freebie manuals and repair notes are HERE

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

Hi,

Here is a tip that I wrote about the LG OE Code and the causes and fixes...

Here also is the complete list of LG Codes

heatman101

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Help! nead at leastone INLET HOSE for AVANTI W797 Washer.

this is what i just found on the internet...
With any washing machine, it is vital to ensure that the load is evenly balanced when using a spin cycle. Redistribute washing by adding or removing items to ensure a more balanced load. ... If the door remains locked and the machine is displaying UE error, please run a drain program.5 Jul 2016

My Samsung washing machine is showing a UE code during a spin ...

or try this link..
Error code UE on LG Front Loading Washing Maching Google Search

UE code is an "unbalance error". Believe it or not, it is possible to unbalance a front load style washing machine. Usually caused by trying to wash smaller loads where the drum spins to try to distribute the weight evenly. With less laundry, you cannot distribute enough weight evenly around the drum and sometimes will cause an unbalanced load. If your problem is not a simple loading issue, it could be the balance sensor, loose wiring, or possibly the main control board. I hope this helps.