check the small drain hose on the side of the pump that is clogged, then that is not a failure that will significantly affect the normal operation of the washer. If your washer is not draining okay and you don't mind catching some water that spills out of that pump filter area when you open it up, then you don't necessarily need to remove that front panel and bother with unclogging that small drain hose. If the large hose between the tub and the pump or the discharge hose between the pump and the house drain behind the washer is clogged, then you may need to open up that cabinet.
you could also check out this link and read up some more on this. LG Tromm front load washer not draining in the spin cycle Google Search
LG washing machine front loader door will not open
The door lock may be jammed or the control board may be powering the lock all the time.
First, unplug the appliance, wait 5 minutes and see if the door opens, with the machine still unplugged.
If it does, then the lock has been continuously powered.
Try the machine again.
If it doesn't unlock it would suggest that it's only a jammed or faulty door lock rather than a faulty control board.
Give the door lock a couple of good thumps, on the front panel adjacent to the handle, to see if it jars the lock loose. (I am assuming the door handle isn't broken and loose).
If it doesn't free off, unplug the appliance and take the top off.
Reach inside and find the door lock, see if you can unlatch it from there. (I'm afraid you can only jiggle around to try and free it).
If it still won't unlock itself the next step is to try and get the lock to come off of it's screws.
Work it side to side, up and down, all the while trying the handle.
Eventually the lock will come off of it's screws.
Lift it off of the door latch and once the door is open, replace the door lock with a new one.
Alternatively, you can use the more brutal method and simply prise the door open.
This will also break the door latch so you would need to replace the door handle/latch assembly as well as the door lock.
(On a few LG machines there is a remote cable to open the door, check where your filter is to see if your machine has this. (It's not mentioned in the service manual) Normally coloured Red).
You can try "resetting" the washer. Unplug or trip circuit breaker. Push and hold power button for 10 seconds. Plug back in. Power on and back off. See if that works. If not, try pushing the door in pretty hard and see if tha releases the lock. If all else fails, you can take the top off, the control panel off and reach down with a long screw driver and manually release the lock. Good luck.
I TOO HAVE BEEN WONDERING HOW TO SPIN ONLY, AND I HAVE THE ANSWER :),, TURN THE POWER BUTTON ON, PUSH THE SPIN SPEED BUTTON NEXT TO DESIRED LEVEL, THEN PRESS START, THERE YOU GO , IT WILL ONLY SPIN, NOT RINSE AND SPIN :), BY THE WAY , I GOT THIS INFO FROM THE ONLINE MANUAL :), SHOULD WORK....
door lock sounds like its broken, you will need to remove the two screws on the back of washer top and remove the top. (power off) now as you look at washer from the front you will see a round object with a pipe. remove the pipe and see if the door opens. this is just to check to see if its this part stopping the door to be open, you are going to need to use a flat blade to push the pin in the lock you should see the pin as this stops the door from being open. the part looks like this https://www.ebay.com/i/253266384384?rt=nc if the door is slammed or banged, it can damage the lock, easy to replace when the you can open the door. wiring plug only fits one way.
Solution. Unplug the machine. Hold the power button for 10 seconds. Plug back in. Push the power button and the washer should turn on. Walk away leaving the machine on. When I did this, I came back to find the drum light off and machine would start on command now. Good luck.