I have a WFT-8501TP (LG). Had the error code PE as well. I used the method found on here, remove, blow. It worked but it also came back on after a few cycle. I called LG Canada (am in Vancouver BC). LG Canada said they didn't even know such a product (parts) code existed.
I ordered one on Amazon.Com, came to 18.97 Canadian dollars.
6501EA1001R
I believe mined was a 1001B, this is the part the LG Canada said it didn't know about or didn't have.
Those that had it, well, it was an arm and a leg, if you get my drift.
I did more research, realize the 1001R looked identical to mine, and same voltage, and it came off an almost identical looking machine, also made by LG, but of newer vintage.
I installed. It is working flawless. No more PE error code. Hopes this helps.
(DII
Pressure sensor switch error; either dissconnected or replace.
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