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LG Dishwasher won' t drain: LG OE (DE) Not blocked?-RESOLVED

LG Dishwasher won' t drain: LG OE (DE) Hose not blocked?

  • Removed and cleaned out entire drain hose. Nothing blocked. Even cleaned out the siphon break assembly (White u bend at top left side).
  • Cleaned out drain pump. Tested resistance: ~3 ohms. And when it runs it has a good amount of water pressure when draining.
  • I ran it in drain mode with vinegar and clean water in a closed loop (e.g, I put the drain hose to drain back into the bu) for ~30 minutes. All good. Flowed away like a water fountain.
  • Here is the predicament. It will drain… and then stop. A forced drain cycle will hear the pump go, but it won’t drain water. If I then blow out the line with a compressor from the sink side and have it visibly bubble up on the inside of the dishwasher, it will then drain. But then f I then try to run any normal cycle, it goes for ~20 minutes and then the OE code. So blowing out the “clean” line seems to reset it for a while, but not for long.
  • Are there other parts or sensors that could be blocked that kill the drain signal?

Update (11/21/2020)

Solved it myself! The y connection to the sink drain got plugged AFTER I started clearing the main line. Problem intially fixed for dishwasher hose was subsequently transferred to the y connections. Solution… always check all paths before and after you clear the main drain hose.

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Please give us your model n umber

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I think its an LDF7774ST. But, since posting this and spending 3 days taking all my dishwasher apart, digging out the air compressor, volt meter, 20 test runs, water all over the kitchen floor etc... I checked the where the drain hose connects to the undersink and found 2 cashews, some gum, and a couple pumpkin seeds. Running now... hasn't failed for the last 30 minutes. So basically it seems like a job I could have fixed with the removal of one hose clamp and a chop stick to poke through the block in 5 minutes.

Update:

So it appears to have been two issues. The line was blocked and then cleared. When I first disconnected the line, the y to the undersink drain was clear. After I blew the line, cleared that and drained the gunk into bucket, and reconnected it, other (now loose) crap then cycled through and plugged the y. All good now.

In summary:

After you clear the line, make sure you also re-check the y connection to the sink drain.

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I think its an LDF7774ST. But, since posting this and spending 3 days taking all my dishwasher apart, digging out the air compressor, volt meter, 20 test runs, water all over the kitchen floor etc... I checked the where the drain hose connects to the undersink and found 2 cashews, some gum, and a couple pumpkin seeds. Running now... hasn't failed for the last 30 minutes. So basically it seems like a job I could have fixed with the removal of one hose clamp and a chop stick to poke through the block in 5 minutes.

Update:

So it appears to have been two issues. The line was blocked and then cleared. When I first disconnected the line, the y to the undersink drain was clear. After I blew the line, cleared that and drained the gunk into bucket, and reconnected it, other (now loose) crap then cycled through and plugged the y. All good now.

In summary:

After you clear the line, make sure you also re-check the y connection to the sink drain.

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