LG electric dryer strange code

[Sarge2133]

 Hi Folks,
My dryer runs, heats, but does dry clothes completely. Ran diagnostics form manual (found here, THANKS!). I get the code "18:FO" followed by "UO1". This flashes between the two codes. Looking for a clue before I tear it apart and start ordering parts.(Assuming I don't use a crowbar on it first!) Oh the unit is just over five years old and , of course, is out of warranty.  Thanks for any help!:ticked off:

Model DLE5977W

[niobrara]

Read a little more of the manual. It will tell you how to advance it.

[Sarge2133]

I have read the manual. I cannot find the code "UO1" listed. Also the indicator for "cooling" remains illuminated when running on "dry". Does anyone know what this code means???

[JWWebster]

Hold down on the 'More Time' and 'Less Time' buttons and press the 'Power' button.  if it comes up with tE1 or tE2 you have a thermistor error.

[Sarge2133]

So far:
Cleaned the machine, removed all collected lint, including from the outside exhaust duct work.
Ran diagnostic, everythng appears ok except the code "18:FO" and "UO1" which flash back and forth.

Any other ideas, anyone?

Thanks!

[JWWebster]

Check for a loose connection from the power cord to the dryer terminal or a loose ground wire to the machine.